148 results on '"Lee, Samuel"'
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2. Supplementary Figure Legends 1-13, Methods from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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Trevor Dale, Wynne Aherne, Julian Blagg, Edward McDonald, Paul Workman, Branko Latinkic, Stephen Wilson, Nicholas Allen, Florence Raynaud, Alysia Battersby, Lee Samuel, Ruth Ruddle, Rodrigo Young, Hannah Botfield, Camilo Quevedo, Olivier Barbeau, Helen Todd, Mark Stubbs, Bożena Pająk, and Kenneth Ewan
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Supplementary Figure Legends 1-13, Methods from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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- 2023
3. Supplementary Figure 13 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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Trevor Dale, Wynne Aherne, Julian Blagg, Edward McDonald, Paul Workman, Branko Latinkic, Stephen Wilson, Nicholas Allen, Florence Raynaud, Alysia Battersby, Lee Samuel, Ruth Ruddle, Rodrigo Young, Hannah Botfield, Camilo Quevedo, Olivier Barbeau, Helen Todd, Mark Stubbs, Bożena Pająk, and Kenneth Ewan
- Abstract
Supplementary Figure 13 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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- 2023
4. Supplementary Figure 12 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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Trevor Dale, Wynne Aherne, Julian Blagg, Edward McDonald, Paul Workman, Branko Latinkic, Stephen Wilson, Nicholas Allen, Florence Raynaud, Alysia Battersby, Lee Samuel, Ruth Ruddle, Rodrigo Young, Hannah Botfield, Camilo Quevedo, Olivier Barbeau, Helen Todd, Mark Stubbs, Bożena Pająk, and Kenneth Ewan
- Abstract
Supplementary Figure 12 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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- 2023
5. Supplementary Figure 10 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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Trevor Dale, Wynne Aherne, Julian Blagg, Edward McDonald, Paul Workman, Branko Latinkic, Stephen Wilson, Nicholas Allen, Florence Raynaud, Alysia Battersby, Lee Samuel, Ruth Ruddle, Rodrigo Young, Hannah Botfield, Camilo Quevedo, Olivier Barbeau, Helen Todd, Mark Stubbs, Bożena Pająk, and Kenneth Ewan
- Abstract
Supplementary Figure 10 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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- 2023
6. Supplementary Figures 6-9 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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Trevor Dale, Wynne Aherne, Julian Blagg, Edward McDonald, Paul Workman, Branko Latinkic, Stephen Wilson, Nicholas Allen, Florence Raynaud, Alysia Battersby, Lee Samuel, Ruth Ruddle, Rodrigo Young, Hannah Botfield, Camilo Quevedo, Olivier Barbeau, Helen Todd, Mark Stubbs, Bożena Pająk, and Kenneth Ewan
- Abstract
Supplementary Figures 6-9 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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- 2023
7. Supplementary Figure 4 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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Trevor Dale, Wynne Aherne, Julian Blagg, Edward McDonald, Paul Workman, Branko Latinkic, Stephen Wilson, Nicholas Allen, Florence Raynaud, Alysia Battersby, Lee Samuel, Ruth Ruddle, Rodrigo Young, Hannah Botfield, Camilo Quevedo, Olivier Barbeau, Helen Todd, Mark Stubbs, Bożena Pająk, and Kenneth Ewan
- Abstract
Supplementary Figure 4 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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- 2023
8. Data from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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Trevor Dale, Wynne Aherne, Julian Blagg, Edward McDonald, Paul Workman, Branko Latinkic, Stephen Wilson, Nicholas Allen, Florence Raynaud, Alysia Battersby, Lee Samuel, Ruth Ruddle, Rodrigo Young, Hannah Botfield, Camilo Quevedo, Olivier Barbeau, Helen Todd, Mark Stubbs, Bożena Pająk, and Kenneth Ewan
- Abstract
The Wnt signaling pathway is frequently deregulated in cancer due to mutations in genes encoding APC, β-catenin, and axin. To identify small-molecule inhibitors of Wnt signaling as potential therapeutics, a diverse chemical library was screened using a transcription factor reporter cell line in which the activity of the pathway was induced at the level of Disheveled protein. A series of deconvolution studies was used to focus on three compound series that selectively killed cancer cell lines with constitutive Wnt signaling. Activities of the compounds included the ability to induce degradation of β-catenin that had been stabilized by a glycogen synthase kinase-3 (GSK-3) inhibitor. This screen illustrates a practical approach to identify small-molecule inhibitors of Wnt signaling that can seed the development of agents suitable to treat patients with Wnt-dependent tumors. Cancer Res; 70(14); 5963–73. ©2010 AACR.
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- 2023
9. Supplementary Figure 5 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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Trevor Dale, Wynne Aherne, Julian Blagg, Edward McDonald, Paul Workman, Branko Latinkic, Stephen Wilson, Nicholas Allen, Florence Raynaud, Alysia Battersby, Lee Samuel, Ruth Ruddle, Rodrigo Young, Hannah Botfield, Camilo Quevedo, Olivier Barbeau, Helen Todd, Mark Stubbs, Bożena Pająk, and Kenneth Ewan
- Abstract
Supplementary Figure 5 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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- 2023
10. Supplementary Figure 11 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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Trevor Dale, Wynne Aherne, Julian Blagg, Edward McDonald, Paul Workman, Branko Latinkic, Stephen Wilson, Nicholas Allen, Florence Raynaud, Alysia Battersby, Lee Samuel, Ruth Ruddle, Rodrigo Young, Hannah Botfield, Camilo Quevedo, Olivier Barbeau, Helen Todd, Mark Stubbs, Bożena Pająk, and Kenneth Ewan
- Abstract
Supplementary Figure 11 from A Useful Approach to Identify Novel Small-Molecule Inhibitors of Wnt-Dependent Transcription
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- 2023
11. Case report: The gait deviation index may predict neurotherapeutic effects of FES-assisted gait training in children with cerebral palsy
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Behboodi, Ahad, Sansare, Aswhini, Zahradka, Nicole, and Lee, Samuel C. K.
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General Earth and Planetary Sciences ,General Medicine ,General Environmental Science - Abstract
BackgroundChildren with cerebral palsy (CP) show progressive loss of ambulatory function characterized by kinematic deviations at the hip, knee, and ankle. Functional electrical stimulation (FES) can lead to more typical lower limb kinematics during walking by eliciting appropriately timed muscle contractions. FES-assisted walking interventions have shown mixed to positive results in improving lower limb kinematics through immediate correction of gait during the application of FES, or long-term, persisting effects of non-FES-assisted gait improvements following multi-week FES-assisted gait training, at the absence of stimulation, i.e., neurotherapeutic effects. It is unknown, however, if children with CP will demonstrate a neurotherapeutic response following FES-assisted gait training because of the CP population's heterogeneity in gait deviations and responses to FES. Identifying the neurotherapeutic responders is, therefore, important to optimize the training interventions to those that have higher probability of benefiting from the intervention.ObjectiveThe purpose of this case study was to investigate the relationship between immediate and neurotherapeutic effects of FES-assisted walking to identify responders to a FES-assisted gait training protocol.MethodsThe primary outcome was Gait Deviation Index (GDI) and secondary outcome was root mean squared error (RMSE) of the lower extremity joint angles in the sagittal plane between participants with CP and a typically developing (TD) dataset. Potential indicators were defined as immediate improvements from baseline during FES-assisted walking followed by neurotherapeutic improvements at the end of training.Case descriptionGait analysis of two adolescent female participants with spastic diplegia (Gross Motor Function Classification System level II and III) was conducted at the start and end of a 12-week FES-assisted treadmill training protocol. Participant 1 had scissoring crouch gait, while participant 2 had jump gait.OutcomesThe GDI showed both immediate (presence of FES) and neurotherapeutic (absence of FES after training period) improvements from baseline in our two participants. Joint angle RMSE showed mixed trends between immediate and neurotherapeutic changes from baseline. The GDI warrants investigation in a larger sample to determine if it can be used to identify responders to FES-assisted gait training.
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- 2023
12. Pf7: an open dataset of Plasmodium falciparum genome variation in 20,000 worldwide samples
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MalariaGEN, Abdel Hamid, Muzamil Mahdi, Abdelraheem, Mohamed Hassan, Acheampong, Desmond Omane, Ahouidi, Ambroise, Ali, Mozam, Almagro-Garcia, Jacob, Amambua-Ngwa, Alfred, Amaratunga, Chanaki, Amenga-Etego, Lucas, Andagalu, Ben, Anderson, Tim, Andrianaranjaka, Voahangy, Aniebo, Ifeyinwa, Aninagyei, Enoch, Ansah, Felix, Ansah, Patrick O, Apinjoh, Tobias, Arnaldo, Paulo, Ashley, Elizabeth, Auburn, Sarah, Awandare, Gordon A, Ba, Hampate, Baraka, Vito, Barry, Alyssa, Bejon, Philip, Bertin, Gwladys I, Boni, Maciej F, Borrmann, Steffen, Bousema, Teun, Bouyou-Akotet, Marielle, Branch, Oralee, Bull, Peter C, Cheah, Huch, Chindavongsa, Keobouphaphone, Chookajorn, Thanat, Chotivanich, Kesinee, Claessens, Antoine, Conway, David J, Corredor, Vladimir, Courtier, Erin, Craig, Alister, D'Alessandro, Umberto, Dama, Souleymane, Day, Nicholas, Denis, Brigitte, Dhorda, Mehul, Diakite, Mahamadou, Djimde, Abdoulaye, Dolecek, Christiane, Dondorp, Arjen, Doumbia, Seydou, Drakeley, Chris, Drury, Eleanor, Duffy, Patrick, Echeverry, Diego F, Egwang, Thomas G, Enosse, Sonia Maria Mauricio, Erko, Berhanu, Fairhurst, Rick M, Faiz, Abdul, Fanello, Caterina A, Fleharty, Mark, Forbes, Matthew, Fukuda, Mark, Gamboa, Dionicia, Ghansah, Anita, Golassa, Lemu, Goncalves, Sonia, Harrison, GL Abby, Healy, Sara Anne, Hendry, Jason A, Hernandez-Koutoucheva, Anastasia, Hien, Tran Tinh, Hill, Catherine A, Hombhanje, Francis, Hott, Amanda, Htut, Ye, Hussein, Mazza, Imwong, Mallika, Ishengoma, Deus, Jackson, Scott A, Jacob, Chris G, Jeans, Julia, Johnson, Kimberly J, Kamaliddin, Claire, Kamau, Edwin, Keatley, Jon, Kochakarn, Theerarat, Konate, Drissa S, Konaté, Abibatou, Kone, Aminatou, Kwiatkowski, Dominic P, Kyaw, Myat P, Kyle, Dennis, Lawniczak, Mara, Lee, Samuel K, Lemnge, Martha, Lim, Pharath, Lon, Chanthap, Loua, Kovana M, Mandara, Celine I, Marfurt, Jutta, Marsh, Kevin, Maude, Richard James, Mayxay, Mayfong, Maïga-Ascofaré, Oumou, Miotto, Olivo, Mita, Toshihiro, Mobegi, Victor, Mohamed, Abdelrahim Osman, Mokuolu, Olugbenga A, Montgomery, Jaqui, Morang'a, Collins Misita, Mueller, Ivo, Murie, Kathryn, Newton, Paul N, Ngo Duc, Thang, Nguyen, Thuy, Nguyen, Thuy-Nhien, Nguyen Thi Kim, Tuyen, Nguyen Van, Hong, Noedl, Harald, Nosten, Francois, Noviyanti, Rintis, Ntui, Vincent Ntui-Njock, Nzila, Alexis, Ochola-Oyier, Lynette Isabella, Ocholla, Harold, Oduro, Abraham, Omedo, Irene, Onyamboko, Marie A, Ouedraogo, Jean-Bosco, Oyebola, Kolapo, Oyibo, Wellington Aghoghovwia, Pearson, Richard, Peshu, Norbert, Phyo, Aung P, Plowe, Christopher V, Price, Ric N, Pukrittayakamee, Sasithon, Quang, Huynh Hong, Randrianarivelojosia, Milijaona, Rayner, Julian C, Ringwald, Pascal, Rosanas-Urgell, Anna, Rovira-Vallbona, Eduard, Ruano-Rubio, Valentin, Ruiz, Lastenia, Saunders, David, Shayo, Alex, Siba, Peter, Simpson, Victoria J, Sissoko, Mahamadou S, Smith, Christen, Su, Xin-Zhuan, Sutherland, Colin, Takala-Harrison, Shannon, Talman, Arthur, Tavul, Livingstone, Thanh, Ngo Viet, Thathy, Vandana, Thu, Aung Myint, Toure, Mahamoudou, Tshefu, Antoinette, Verra, Federica, Vinetz, Joseph, Wellems, Thomas E, Wendler, Jason, White, Nicholas J, Whitton, Georgia, Yavo, William, Van Der Pluijm, Rob W, Amenga-Etego, Lucas [0000-0003-4468-0506], Anderson, Tim [0000-0002-0191-0204], Ansah, Patrick O [0000-0002-3214-5621], Ashley, Elizabeth [0000-0002-7620-4822], Ba, Hampate [0000-0002-9299-5775], Baraka, Vito [0000-0001-9694-9293], Bejon, Philip [0000-0002-2135-7549], Bertin, Gwladys I [0000-0002-2218-9591], Boni, Maciej F [0000-0002-0830-9630], Bousema, Teun [0000-0003-2666-094X], Chookajorn, Thanat [0000-0003-2876-6203], Claessens, Antoine [0000-0002-4277-0914], Conway, David J [0000-0002-8711-3037], Craig, Alister [0000-0003-0914-6164], D'Alessandro, Umberto [0000-0001-6341-5009], Day, Nicholas [0000-0003-2309-1171], Diakite, Mahamadou [0000-0002-4268-8857], Djimde, Abdoulaye [0000-0003-0062-2283], Dondorp, Arjen [0000-0001-5190-2395], Drakeley, Chris [0000-0003-4863-075X], Echeverry, Diego F [0000-0003-0301-4478], Erko, Berhanu [0000-0003-1685-752X], Faiz, Abdul [0000-0002-3460-7535], Fanello, Caterina A [0000-0003-1932-9562], Gamboa, Dionicia [0000-0002-1420-7729], Golassa, Lemu [0000-0002-1216-8711], Healy, Sara Anne [0000-0003-3078-6094], Ishengoma, Deus [0000-0003-2040-3416], Jackson, Scott A [0000-0002-3172-1607], Kamaliddin, Claire [0000-0001-8198-6235], Kamau, Edwin [0000-0002-5761-7883], Konate, Drissa S [0000-0002-4177-9642], Kwiatkowski, Dominic P [0000-0002-5023-0176], Kyle, Dennis [0000-0002-0238-965X], Lawniczak, Mara [0000-0002-3006-2080], Loua, Kovana M [0000-0003-0571-0944], Marsh, Kevin [0000-0001-8377-5466], Mayxay, Mayfong [0000-0002-6056-4516], Miotto, Olivo [0000-0001-8060-6771], Mita, Toshihiro [0000-0001-8180-2344], Mobegi, Victor [0000-0002-1962-5583], Morang'a, Collins Misita [0000-0002-6988-150X], Nguyen, Thuy-Nhien [0000-0002-4101-5706], Nosten, Francois [0000-0002-7951-0745], Ntui, Vincent Ntui-Njock [0000-0002-7532-9930], Oduro, Abraham [0000-0002-4191-7419], Onyamboko, Marie A [0000-0002-7501-5931], Ouedraogo, Jean-Bosco [0000-0003-0412-8733], Oyebola, Kolapo [0000-0002-1003-2570], Pearson, Richard [0000-0002-7386-3566], Phyo, Aung P [0000-0002-0383-9624], Price, Ric N [0000-0003-2000-2874], Rayner, Julian C [0000-0002-9835-1014], Rosanas-Urgell, Anna [0000-0002-0432-5203], Shayo, Alex [0000-0002-7099-8537], Su, Xin-Zhuan [0000-0003-3246-3248], Vinetz, Joseph [0000-0001-8344-2004], Wellems, Thomas E [0000-0003-3899-8454], and Apollo - University of Cambridge Repository
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data resource ,plasmodium falciparum ,genomics ,malaria ,genomic epidemiology - Abstract
We describe the MalariaGEN Pf7 data resource, the seventh release of Plasmodium falciparum genome variation data from the MalariaGEN network. It comprises over 20,000 samples from 82 partner studies in 33 countries, including several malaria endemic regions that were previously underrepresented. For the first time we include dried blood spot samples that were sequenced after selective whole genome amplification, necessitating new methods to genotype copy number variations. We identify a large number of newly emerging crt mutations in parts of Southeast Asia, and show examples of heterogeneities in patterns of drug resistance within Africa and within the Indian subcontinent. We describe the profile of variations in the C-terminal of the csp gene and relate this to the sequence used in the RTS,S and R21 malaria vaccines. Pf7 provides high-quality data on genotype calls for 6 million SNPs and short indels, analysis of large deletions that cause failure of rapid diagnostic tests, and systematic characterisation of six major drug resistance loci, all of which can be freely downloaded from the MalariaGEN website.
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- 2023
13. Validation of a New Measure of Moral Neutralization
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Lee, Samuel
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Rationalization ,Neutralization ,Social Cognitive Theory ,Moral disengagement ,Drift Theory ,Social and Behavioral Sciences ,Moral Neutralization ,health care economics and organizations ,humanities - Abstract
We will validate a new measure of moral neutralization by assessing its factor structure and how it is correlated with other variables
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- 2022
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14. Moral Disengagement and Workplace Deviance Meta
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Lee, Samuel
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- 2022
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15. The Influence of Technostress on Hotel Guests
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Lee, Samuel
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The implementation of technology in the hospitality sector is rapidly growing. Although there are practical, economic, and experiential benefits of hospitality technology, the increased adoption of guest service technologies such as digital room keys, check-in kiosks, and service robots can also introduce friction points in a guest’s hotel experience. Technostress is any form of stress induced by the usage of technology and this study is among the first to apply this concept to consumer behavior. Based on the transactional model of stress and coping and social cognitive theory, this dissertation examined the effects of technostress on hotel guests, using a mixed-method approach comprised of three sequential phases. A qualitative examination of guest experiences with hotel technology indicated Wi-Fi, hotel smartphone apps, and smart TVs to be the most prominent stress-inducing technologies with particular themes pertaining to each technology. These technologies were also associated with the technostress factors: techno-overload, techno-invasion, techno-complexity, and techno-uncertainty. Quantitative data showed significant relationships between technology self-efficacy, one’s locus of control, and technostress; additionally, technostress was shown to significantly impact guest satisfaction. The findings of this dissertation extend technostress beyond workplace applications and drive recommendations for hotels to better address the technostress that negatively impacts guest satisfaction.
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- 2022
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16. A rapid assessment of the population structure of the short-spined white sea urchins, Salmacis sphaeroides (Linnaeus, 1758), on Singapore’s shores
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Choo, Mia S, Ying, Lynette S. M., Lee, Samuel H. R., Todd, Peter A., Teo, Serena L.-M., and Neo, M. L.
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density ,intertidal surveys ,echinoderms ,distribution ,allometry ,sea urchins - Abstract
Nature in Singapore, 14, 1-9
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- 2021
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17. Impact of COVID-19 on the Mental Health of USC Students and Transition to Remote Learning: A Retrospective Study
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Cheng, David, Chung, Christian, Lee, Samuel, Nguyen, Kelly, and Nguyen, Vina
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- 2020
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18. User Perceptions & Subjective Memory Concerns are Associated With Brief, Remote Cognitive Assessment Performance
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Lee, Samuel, Dorociak, Katherine, Mattek, Nora, Gothard, Sarah, Lee, Jonathan, Kaye, Jeffrey, and Hughes, Adriana
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Abstracts ,Health (social science) ,Session 9050 (Poster) ,AcademicSubjects/SOC02600 ,Life-span and Life-course Studies ,Health Professions (miscellaneous) ,All Things Technology and Aging - Abstract
Online cognitive tests offer a cost-effective, accessible means of cognitive screening and may prove especially important for individuals with memory complaints, a risk factor for cognitive impairment (Kaup et al., 2015). Although older adults’ perceptions of everyday technologies impact their uptake and adoption, there is limited understanding about how perceptions of online cognitive screening tests impact test performance. The purpose of the current study was to examine relationships between performance on a brief, self-administered, web-based cognitive assessment tool (SMART) and user perceptions (e.g., ratings of challenge and length), technology confidence, brain health activities, and memory complaints. Participants were 1336 adults without a diagnosis of cognitive impairment (Mage=60.48 years, SD=15.18; 65.8% female; 81.8% White; 21.2% with subjective memory complaints). Most participants (97%) were willing to complete the SMART again, with over half (53.5%) willing to complete the SMART on at least a weekly basis. After adjusting for age and education, better SMART performance (i.e., faster completion time) was associated with user ratings of greater ease of completion, higher technology confidence, and greater participation in brain health activities (p
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- 2021
19. Insulin Regulation of Reverse Cholesterol Transport
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Lee, Samuel
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High density lipoproteins--Metabolism ,Cholesterol ,lipids (amino acids, peptides, and proteins) ,Insulin resistance ,Biology ,Nutrition - Abstract
Insulin resistance and type 2 diabetes are pathogenetically linked to increased risk of cardiovascular disease. While insulin resistance is defined by a dysregulation in hepatic insulin signaling, it is unclear how this impairment relates to the development of cardiovascular disease. Recently, there has been evidence showing that in insulin resistant individuals, cardiovascular disease is associated with a defect in reverse cholesterol transport – the cardioprotective process by which excess cholesterol is removed from the periphery, and returned to the liver for biliary excretion. Reverse cholesterol transport is facilitated by high-density lipoprotein (HDL) metabolism. Thus, malfunction in HDL turnover during reverse cholesterol transport may contribute to the buildup of atherosclerotic plaques, and subsequent cardiovascular disease in insulin resistant individuals. In this thesis, we seek to establish a better understanding of HDL metabolism and reverse cholesterol transport, as they relate to key transcription factors that mediate hepatic insulin signaling, namely the insulin-repressible forkhead transcription factors, FoxO1, FoxO3, and FoxO4 (FoxOs). We demonstrate that mice with liver-specific triple FoxO knockout (L-FoxO1,3,4) have increased HDL-cholesterol (HDL-C), associated with decreased expression of HDL-C clearance factors, scavenger receptor class B type I (SR-BI) and hepatic lipase, and defective selective uptake of HDL-cholesteryl ester by the liver. As such, we uncover a novel mechanism by which HDL-mediated reverse cholesterol transport to the liver is regulated by the hepatic insulin-->FoxO signaling pathway.
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- 2019
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20. Prior therapy with sofosbuvir/velpatasvir associated with reduced response to sofosbuvir/velpatasvir/voxilaprevir: results from a Canadian Prospective Registry
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Onofrio, Fernanda, Cooper, Curtis, Borgia, Sergio, ML Vachon, Alnoor Ramji, Lilly, Les, A. Wong, Booth, Joshua, Izza Sattar, Morales, Heidy, Lee, Samuel, Conway, Brian, and Feld, Jordan
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- 2019
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21. Additional file 1: of A 3-year follow-up study after treatment with simeprevir in combination with pegylated interferon-Îą and ribavirin for chronic hepatitis C virus infection
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Zoulim, Fabien, Moreno, Christophe, Lee, Samuel, Buggisch, Peter, Horban, Andrzej, Lawitz, Eric, Corbett, Chris, Lenz, Oliver, Fevery, Bart, Verbinnen, Thierry, Shukla, Umesh, and Jessner, Wolfgang
- Abstract
Results (liver disease evolution) Description of data: Hepatic disease progression was assessed as a secondary objective in this study with optional data collection, and the limited data available are displayed in this additional file. (DOCX 17Â kb)
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- 2018
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22. Effects of Ramp Rates with Short Holding Time on the Sinterability of Hydroxyapatite
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Chou Yong Tan, Boon Kar Yap, Ramesh Singh, Lai Kuan Lee Samuel, Ranna Tolouei, and M. Amiriyan
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Materials science ,Fracture toughness ,visual_art ,Vickers hardness test ,General Engineering ,visual_art.visual_art_medium ,Sintering ,Relative density ,Modulus ,Ceramic ,Composite material ,Chemical composition ,Shrinkage - Abstract
Hydroxyapatite (HA) is by far the closest match to the human bone in terms of chemical composition. Furthermore, HA boasts excellent biocompatibility thus earning its reputation for human bone replacement. However, HA lacks desirable mechanical properties (i.e. hardness, fracture toughness, etc.). Due to the poor heat conductivity of ceramics, it is hypothesized that HA when sintered via conventional pressureless sintering, smaller ramp rates are advantageous as oppose to larger ramp rates. These advantages can be observed as improved densification along with improved mechanical properties. In the present work, the sintering profile for the HA green bodies were held at 1 minute in comparison to the usual 2 hours holding time. The applied ramp rates were 2 °C/min, 5 °C/min and 10 °C/min. Sintering temperatures were set to 1000, 1100, 1200, and 1300 °C. Sample characterization was then reviewed in the aspects of phase stability, % shrinkage, bulk and relative density, Young’s modulus, Vickers hardness, as well as fracture toughness. The results revealed that sintering with shorter holding time yielded an improvement in the mechanical properties of HA. It was observed that sintering HA with a 2 °C/min ramp rate does not result in the formation of extrageneous phases even when sintered to 1300 °C. Similarly at 2 °C/min and 1300 °C, densification was observed to be 99.05 %. In addition, Young’s modulus recorded its highest value (117.03 GPa) when sintered with a ramp rate of 2°C/min. It was also observed that sintering HA at a ramp rate of 2°C/min produced a hardness value of 5.88 GPa (improvement of 0.68 GPa when compared with 2 hours holding time).
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- 2012
23. The exocyst in Candida albicans polarized secretion and filamentation
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Chavez-Dozal, Alba A., Bernardo, Stella M., and Lee, Samuel A.
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Article - Abstract
The exocyst is an octameric complex that orchestrates the docking and tethering of vesicles to the plasma membrane during exocytosis and is fundamental for key biological processes including growth and establishment of cell polarity. Although components of the exocyst are well conserved among fungi, the specific functions of each component of the exocyst complex unique to Candida albicans biology and pathogenesis are not fully understood. This commentary describes recent findings regarding the role of exocyst subunits Sec6 and Sec15 in C. albicans filamentation and virulence.
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- 2015
24. Pulsar timing array observations of gravitational wave source timing parallax
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Xihao Deng and Lee Samuel Finn
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Wavefront ,Physics ,Wavelength ,Pulsar timing array ,Pulsar ,Space and Planetary Science ,Gravitational wave ,Astrophysics::Instrumentation and Methods for Astrophysics ,Astronomy and Astrophysics ,Astrophysics ,Parallax ,Curvature ,Pulse (physics) - Abstract
Pulsar timing arrays (PTAs) act to detect gravitational waves by observing the small, correlated effect the waves have on pulse arrival times at the Earth. This effect has conventionally been evaluated assuming the gravitational wave phase fronts are planar across the array, an assumption that is valid only for sources at distances R >> 2πL 2 /λ, where L is physical extent of the array and λ is the radiation wavelength. In the case of PTAs, the array size is of the order of the pulsar-Earth distance (kpc) and λ is of the order of parsec. Correspondingly, for point gravitational wave sources closer than ~100 Mpc, the PTA response is sensitive to the source parallax across the pulsar-Earth baseline. Here, we evaluate the PTA response to gravitational wave point sources including the important wavefront curvature effects. Taking the wavefront curvature into account, the relative amplitude and phase of the timing residuals associated with a collection of pulsars allow us to measure the distance to, and the sky position of, the source.
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- 2011
25. Low-level microbial contamination of liquid in syringe hubs leads to an unacceptable risk to the end product
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Lee Samuel, Jean-Yves Maillard, Gareth John Williams, Callum Cooper, Noorsuriani Yusop, and Rachel Burton
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Pharmacology ,biology ,business.industry ,Syringes ,Microorganism ,Pharmaceutical Science ,Contamination ,Microbial contamination ,biology.organism_classification ,Microbiology ,Risk Factors ,Staphylococcus epidermidis ,Equipment Contamination ,Medicine ,Bacterial contaminants ,Food science ,business ,Incubation ,Syringe ,Bacillus subtilis - Abstract
Objectives The aim of this study was to assess the risk associated with microbial contamination in the hub-fluid in Luer-lock syringes to the end-product, and ultimately patients. Methods The hub-fluid of 48 sterile syringes prefilled with broth was contaminated with a low number of Staphylococcus epidermidis or spores of Bacillus subtilis. After incubation for three weeks, the syringe fills were tested for the presence of bacterial contaminants and some syringes were used to inoculate an end product broth that was then investigated for the presence of microorganisms. Key findings After three weeks of incubation only 20.8% of syringe fills showed turbidity, although following further investigation 70.8% were positive for the presence of viable bacteria, whereas 95.6% of end products became contaminated following injection of the syringe fill. Conclusions These findings add quantitative data that support the current practice of discarding syringes with residue around the cap.
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- 2010
26. DETECTION, LOCALIZATION, AND CHARACTERIZATION OF GRAVITATIONAL WAVE BURSTS IN A PULSAR TIMING ARRAY
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Andrea N. Lommen and Lee Samuel Finn
- Subjects
Physics ,Supermassive black hole ,010308 nuclear & particles physics ,Gravitational wave ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astronomy and Astrophysics ,General Relativity and Quantum Cosmology (gr-qc) ,Astrophysics ,Polarization (waves) ,01 natural sciences ,General Relativity and Quantum Cosmology ,Cosmic string ,Pulsar timing array ,Amplitude ,Pulsar ,13. Climate action ,Space and Planetary Science ,Physics - Data Analysis, Statistics and Probability ,0103 physical sciences ,Waveform ,Astrophysics - Instrumentation and Methods for Astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,010303 astronomy & astrophysics ,Data Analysis, Statistics and Probability (physics.data-an) - Abstract
Efforts to detect gravitational waves by timing an array of pulsars have focused traditionally on stationary gravitational waves: e.g., stochastic or periodic signals. Gravitational wave bursts --- signals whose duration is much shorter than the observation period --- will also arise in the pulsar timing array waveband. Sources that give rise to detectable bursts include the formation or coalescence of supermassive black holes (SMBHs), the periapsis passage of compact objects in highly elliptic or unbound orbits about a SMBH, or cusps on cosmic strings. Here we describe how pulsar timing array data may be analyzed to detect and characterize these bursts. Our analysis addresses, in a mutually consistent manner, a hierarchy of three questions: \emph{i}) What are the odds that a dataset includes the signal from a gravitational wave burst? \emph{ii}) Assuming the presence of a burst, what is the direction to its source? and \emph{iii}) Assuming the burst propagation direction, what is the burst waveform's time dependence in each of its polarization states? Applying our analysis to synthetic data sets we find that we can \emph{detect} gravitational waves even when the radiation is too weak to either localize the source of infer the waveform, and \emph{detect} and \emph{localize} sources even when the radiation amplitude is too weak to permit the waveform to be determined. While the context of our discussion is gravitational wave detection via pulsar timing arrays, the analysis itself is directly applicable to gravitational wave detection using either ground or space-based detector data., Comment: 43 pages, 13 figures, submitted to ApJ.
- Published
- 2010
27. Maximum Entropy for Gravitational Wave Data Analysis: Inferring the Physical Parameters of Core‐Collapse Supernovae
- Author
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Lee Samuel Finn, Adam Burrows, Christian D. Ott, and T. Z. Summerscales
- Subjects
Physics ,Angular momentum ,010308 nuclear & particles physics ,Gravitational wave ,Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics (astro-ph) ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Rotation ,01 natural sciences ,LIGO ,General Relativity and Quantum Cosmology ,Supernova ,Space and Planetary Science ,0103 physical sciences ,Differential rotation ,Waveform ,010303 astronomy & astrophysics ,Event (particle physics) ,Astrophysics::Galaxy Astrophysics - Abstract
The gravitational wave signal arising from the collapsing iron core of a Type II supernova progenitor star carries with it the imprint of the progenitor's mass, rotation rate, degree of differential rotation, and the bounce depth. Here, we show how to infer the gravitational radiation waveform of a core collapse event from noisy observations in a network of two or more LIGO-like gravitational wave detectors and, from the recovered signal, constrain these source properties. Using these techniques, predictions from recent core collapse modeling efforts, and the LIGO performance during its S4 science run, we also show that gravitational wave observations by LIGO might have been sufficient to provide reasonable estimates of the progenitor mass, angular momentum and differential angular momentum, and depth of the core at bounce, for a rotating core collapse event at a distance of a few kpc., 44 pages, 12 figures; accepted version scheduled to appear in Ap J 1 April 2008
- Published
- 2008
28. GEO600: status and plans
- Author
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Benno Willke and Lee Samuel Finn
- Subjects
Physics ,Gravitational-wave observatory ,Physics and Astronomy (miscellaneous) ,Detector ,Astrophysics ,Sensitivity (control systems) ,GEO600 ,LIGO Scientific Collaboration - Abstract
The GEO600 gravitational wave detector located near Hannover in Germany is one of the four detectors of the LIGO Scientific Collaboration (LSC). For almost the entire year of 2006, GEO600 participated in the S5 science run of the LSC. Overall an equivalent of about 270 days of science data with an average peak sensitivity of better than 3 × 10 −22 Hz −1/2 have been acquired so far. In this paper, we describe the status of the GEO600 project during the period between January 2006 and February 2007. In addition, plans for the near-term and medium-term future are discussed.
- Published
- 2007
29. Identifying correlated environmental noise in co-located interferometers with application to stochastic gravitational wave analysis
- Author
-
Bernard F Whiting and Lee Samuel Finn
- Subjects
Gravitational wave background ,Physics ,Classical mechanics ,Physics and Astronomy (miscellaneous) ,Coupling (computer programming) ,Gravitational wave ,Stochastic process ,Statistical physics ,Environmental noise ,Thresholding ,LIGO ,Coherence (physics) - Abstract
Despite their intrinsic advantages due to co-location, the two LIGO Hanford interferometers have not been used in the search for the stochastic gravitational wave background due to their coupling to a shared environment, which may be comparable to or exceed any gravitational signal. In this paper, using S4 data, we demonstrate a technique to relate the H1–H2 coherence to coupling with physical environmental channels. We show that the correspondence is tight enough to correctly identify regions of high and low coupling and the nature of the coupling in the data set. A simple thresholding provides frequency vetoes, which we can use to derive a significantly cleaner coherence spectrum. The output of this preliminary investigation suggests that H1–H2 may soon be ready to contribute to the stochastic search.
- Published
- 2006
30. Status of LIGO at the start of the fifth science run
- Author
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Bernard F Whiting, David Ottaway, and Lee Samuel Finn
- Subjects
Physics ,Interferometry ,Neutron star ,Physics and Astronomy (miscellaneous) ,Astronomical interferometer ,Astronomy ,Astrophysics ,LIGO - Abstract
In November 2005, the LIGO interferometer network began data taking for its latest data run (S5). All three interferometers are working at design sensitivities with duty cycles expected to reach 80%. The Hanford 4 km detector regularly achieves aneutron star inspiral range of 12 Mpc. The S5 data run will record one year of coincident science data at unprecedented sensitivity ending in mid 2007.
- Published
- 2006
31. Multidimensional classification of kleineWelle triggers from LIGO science run
- Author
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Bernard F Whiting and Lee Samuel Finn
- Subjects
Event trigger ,Physics ,Theoretical physics ,Physics and Astronomy (miscellaneous) ,Data mining ,computer.software_genre ,computer ,LIGO - Abstract
Multidimensional classification analysis is performed on burst triggers generated by event trigger generating algorithms such as the kleineWelle algorithm in LIGO's fifth science run data. The analysis is meant to extract more information from the structures present in the data in higher dimensions and also aid in vetoing non-gravitational wave signals by grouping triggers with similar characteristics. The parameters used in the analysis include time–frequency information as well as shape attributes of the triggers. The method is demonstrated on data from one of the LIGO environmental channels.
- Published
- 2006
32. Event Rate for Extreme Mass Ratio Burst Signals in the Laser Interferometer Space Antenna Band
- Author
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Kelly Holley-Bockelmann, Lee Samuel Finn, and Louis J. Rubbo
- Subjects
Physics ,Gravitational-wave observatory ,Stellar mass ,Gravitational wave ,Astronomy ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Mass ratio ,Galaxy ,Black hole ,General Relativity and Quantum Cosmology ,Space and Planetary Science ,Stellar dynamics ,Astrophysics::Galaxy Astrophysics ,Gravitational redshift - Abstract
Stellar mass compact objects in short-period (P 103 s) orbits about a 104.5-107.5 M☉ massive black hole (MBH) are thought to be a significant continuous-wave source of gravitational radiation for the ESA/NASA Laser Interferometer Space Antenna (LISA) gravitational wave detector. These extreme mass ratio inspiral sources began in long-period, nearly parabolic orbits that have multiple close encounters with the MBH. The gravitational radiation emitted during the close encounters may be detectable by LISA as a gravitational wave burst if the characteristic passage timescale is less than 105 s. Scaling a static, spherical model to the size and mass of the Milky Way bulge, we estimate an event rate of ~15 yr-1 for such burst signals, detectable by LISA with signal-to-noise ratio greater than 5, originating in our Galaxy. When extended to include Virgo Cluster galaxies, our estimate increases to a gravitational wave burst rate of ~18 yr-1. We conclude that these extreme mass ratio burst sources may be a steady and significant source of gravitational radiation in the LISA data streams.
- Published
- 2006
33. The status of laser interferometer gravitational-wave detectors
- Author
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Bernard F Whiting and Lee Samuel Finn
- Subjects
Physics ,History ,Gravitational-wave observatory ,Physics::Instrumentation and Detectors ,business.industry ,Gravitational wave ,Detector ,Astrophysics::Instrumentation and Methods for Astrophysics ,Laser ,GEO600 ,LIGO ,Computer Science Applications ,Education ,law.invention ,General Relativity and Quantum Cosmology ,Interferometry ,Optics ,law ,Astronomical interferometer ,High Energy Physics::Experiment ,business - Abstract
There has been a rapid advance in the sensitivity of broadband searches for gravitational waves, using an international network of kilometer-scale laser interferometers. The LIGO detectors in North America, the GEO600 detector in Germany and the TAMA300 detector in Japan have conducted searches for gravitational waves covering a frequency range from below 100 Hz up to many kHz. These detectors and the VIRGO detector in Italy are in a mature state of commissioning and technology development for a generation of more advanced detectors is ongoing.
- Published
- 2006
34. Status of the LIGO detectors
- Author
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Bernard F Whiting, Daniel Sigg, David Ottaway, and Lee Samuel Finn
- Subjects
Physics ,Neutron star ,Physics and Astronomy (miscellaneous) ,Duty cycle ,Gravitational wave ,Binary star ,Detector ,Range (statistics) ,Binary number ,Astronomy ,Astrophysics ,LIGO - Abstract
All three LIGO detectors have reached sensitivities within a factor of 2 of design over a wide range of frequencies. A sky-averaged detection range (SNR > 8) of more than 10 Mpc for inspiral binary neutron stars with masses of 1.4 Msol has been achieved with the best instrument. The fourth LIGO science run taking data for 30 days has been completed earlier this year with a triple coincidence duty cycle greater than 50%. A commissioning effort to scale up the cavity powers to design sensitivity as well as preparations for an extended science run is underway. The data from the first two science runs were fully analysed and results are summarized.
- Published
- 2006
35. Reducing gravitational wave false alarms using signals at the antisymmetric port in LIGO detectors
- Author
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Bernard F Whiting and Lee Samuel Finn
- Subjects
Physics ,Physics and Astronomy (miscellaneous) ,Antisymmetric relation ,Gravitational wave ,Astrophysics::High Energy Astrophysical Phenomena ,Acoustics ,Detector ,Astrophysics::Instrumentation and Methods for Astrophysics ,Binary number ,Port (circuit theory) ,Astrophysics ,LIGO ,Neutron star ,Coincident ,Astrophysics::Solar and Stellar Astrophysics - Abstract
We show that many of the false alarms found in the search for binary neutron stars during the LIGO S3 science run are coincident with glitches in an auxiliary channel from the photo diode at the antisymmetric port. By studying how the glitches compare with simulated gravitational waves we were able to find a method that vetoes the false alarms while minimizing the potential for false dismissal.
- Published
- 2006
36. Searching for gravitational waves from known pulsars
- Author
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Bernard F Whiting, Matthew Pitkin, and Lee Samuel Finn
- Subjects
Physics ,Physics and Astronomy (miscellaneous) ,Gravitational wave ,Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics (astro-ph) ,Astrophysics::Instrumentation and Methods for Astrophysics ,FOS: Physical sciences ,Binary number ,General Relativity and Quantum Cosmology (gr-qc) ,Astrophysics ,Moment of inertia ,General Relativity and Quantum Cosmology ,LIGO ,Constraint (information theory) ,Amplitude ,Pulsar ,Range (statistics) - Abstract
We present upper limits on the amplitude of gravitational waves from 28 isolated pulsars using data from the second science run of LIGO. The results are also expressed as a constraint on the pulsars' equatorial ellipticities. We discuss a new way of presenting such ellipticity upper limits that takes account of the uncertainties of the pulsar moment of inertia. We also extend our previous method to search for known pulsars in binary systems, of which there are about 80 in the sensitive frequency range of LIGO and GEO 600., Comment: Accepted by CQG for the proceeding of GWDAW9, 7 pages, 2 figures
- Published
- 2005
37. Using the INSPIRAL program to search for gravitational waves from low-mass binary inspiral
- Author
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Bernard F Whiting, Duncan Brown, and Lee Samuel Finn
- Subjects
Physics ,Physics and Astronomy (miscellaneous) ,010308 nuclear & particles physics ,Gravitational wave ,Astrophysics::High Energy Astrophysical Phenomena ,Pipeline (computing) ,FOS: Physical sciences ,Binary number ,Astronomy ,General Relativity and Quantum Cosmology (gr-qc) ,01 natural sciences ,General Relativity and Quantum Cosmology ,LIGO ,Neutron star ,0103 physical sciences ,010306 general physics ,Low Mass ,Caltech Library Services ,LIGO Scientific Collaboration - Abstract
The INSPIRAL program is the LIGO Scientific Collaboration's computational engine for the search for gravitational waves from binary neutron stars and sub-solar mass black holes. We describe how this program, which makes use of the FINDCHIRP algorithm (discussed in a companion paper), is integrated into a sophisticated data analysis pipeline that was used in the search for low-mass binary inspirals in data taken during the second LIGO science run., 11 pages, 3 figures, submitted to Classical and Quantum Gravity for the special issue of the GWDAW9 Proceedings
- Published
- 2005
38. Improvements in strain calibration for the third LIGO science run
- Author
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Bernard F Whiting and Lee Samuel Finn
- Subjects
Physics ,Physics and Astronomy (miscellaneous) ,business.industry ,Calibration (statistics) ,LIGO ,Interferometry ,Amplitude ,Optics ,Astronomical interferometer ,Sensitivity (control systems) ,Fiducial marker ,business ,Algorithm ,LIGO Scientific Collaboration - Abstract
Amplitude calibration procedures have been developed by the LIGO Scientific Collaboration (LSC) for use in determining the strain sensitivity of the three LIGO interferometers. These frequency-domain procedures rely on a fiducial calibration taken at a reference time t0. The calibration is then propagated to all other times during the science run via calibration factors (denoted by α and β), which are derived from sinusoidal length excitations in interferometer cavity lengths. We briefly review the standard calibration methods that were employed in the first two LIGO science runs (S1 and S2), and then describe improvements in calibration procedures implemented during the third science run S3.
- Published
- 2005
39. Gravitational wave burst vetoes in the LIGO S2 and S3 data analyses
- Author
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Bernard F Whiting and Lee Samuel Finn
- Subjects
Physics ,Physics and Astronomy (miscellaneous) ,010308 nuclear & particles physics ,Gravitational wave ,Detector ,FOS: Physical sciences ,Context (language use) ,General Relativity and Quantum Cosmology (gr-qc) ,Astrophysics ,01 natural sciences ,General Relativity and Quantum Cosmology ,LIGO ,Noise ,Interferometry ,Quality (physics) ,0103 physical sciences ,010306 general physics ,Spurious relationship - Abstract
The LIGO detectors collected about 4 months of data in 2003-2004 during two science runs, S2 and S3. Several environmental and auxiliary channels that monitor the instruments' physical environment and overall interferometric operation were analyzed in order to establish the quality of the data as well as the presence of transients of non-astrophysical origin. This analysis allowed better understanding of the noise character of the instruments and the establishment of correlations between transients in these channels and the one recording the gravitational wave strain. In this way vetoes for spurious burst were identified. We present the methodology we followed in this analysis and the results from the S2 and S3 veto analysis within the context of the search for gravitational wave bursts., Comment: 9 pages, 4 figures, submitted to Classical and Quantum Gravity for the special issue of the GWDAW9 Proceedings
- Published
- 2005
40. Preparing GEO 600 for gravitational wave astronomy—a status report
- Author
-
Bernard F Whiting and Lee Samuel Finn
- Subjects
Physics ,Gravitational-wave observatory ,Physics and Astronomy (miscellaneous) ,Physics::Instrumentation and Detectors ,Gravitational wave ,media_common.quotation_subject ,Detector ,Astrophysics::Instrumentation and Methods for Astrophysics ,Astronomy ,Gravitational-wave astronomy ,Universe ,Neutron star ,Supernova ,Continuous wave ,media_common - Abstract
A number of gravitational wave detectors throughout the world are currently moving from the final stages of commissioning to a more continuous observational mode. Together, these detectors form a global network which will search for gravitational waves from various astrophysical sources, such as continuous wave signals from rotating neutron stars, transient signals from, for example, inspiralling compact objects and supernovae explosions, and stochastic gravitational wave signals from the early universe. GEO 600 is a long baseline laser-interferometric gravitational wave detector which employs advanced optical and suspension techniques to reach its design sensitivity. Almost all of the major installation work at GEO 600 is already completed and the detector is currently being commissioned to prepare it for extended observation periods. The commissioning process involves many activities in the areas of noise reduction, calibration, operational stability and characterization. This report highlights some of the major commissioning steps that have contributed to the increase in sensitivity of the instrument over the period from December 2003 to December 2004. In addition, recent extensions to the on-line calibration scheme used in GEO 600 are briefly discussed.
- Published
- 2005
41. Passage Retrieval and Calculation Method of Topic Field by Using Field-Associated Terms
- Author
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Lee Samuel-Sangkon
- Subjects
Training set ,Information retrieval ,Recall ,business.industry ,Computer science ,Transition (fiction) ,Artificial intelligence ,computer.software_genre ,business ,computer ,Natural language processing ,Field (computer science) ,Sentence - Abstract
It is important to segment a text, which is independent upon any text-embedded auxiliary information. This paper presents a technique for dividing the text into field-coherent passages. The presented method is based upon extracting field-associated terms from the text measuring how the topics grow, shrink and shift from sentence to sentence. We propose measures of topic continuity and of topic transition and suggest how those could be used to find the boundaries among passages. After collecting 12,500 documents, we obtain for average precision and for recall in Korean training set.
- Published
- 2005
42. Overview of the BlockNormal event trigger generator
- Author
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E. Rotthoff, M. Ashley, A. L. Stuver, John W. C. McNabb, T. Summerscales, Kip S. Thorne, M. Tibbits, K. D. Zaleski, Lee Samuel Finn, and P. J. Sutton
- Subjects
Data stream ,Physics ,Physics and Astronomy (miscellaneous) ,General Relativity and Cosmology ,010308 nuclear & particles physics ,Gravitational wave ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) ,01 natural sciences ,General Relativity and Quantum Cosmology ,Term (time) ,Event trigger ,0103 physical sciences ,Time series ,010306 general physics ,Algorithm ,Caltech Library Services ,Generator (mathematics) ,Block (data storage) - Abstract
In the search for unmodeled gravitational wave bursts, there are a variety of methods that have been proposed to generate candidate events from time series data. Block Normal is a method of identifying candidate events by searching for places in the data stream where the characteristic statistics of the data change. These change-points divide the data into blocks in which the characteristics of the block are stationary. Blocks in which these characteristics are inconsistent with the long term characteristic statistics are marked as Event-Triggers which can then be investigated by a more computationally demanding multi-detector analysis., GWDAW-8 proceedings, 6 pages, 2 figures
- Published
- 2004
43. First upper limits from LIGO on gravitational wave bursts
- Author
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Guenakh Mitselmakher, Nelson Christensen, Amber Stuver, Bernard Schutz, Bernard F Whiting, Lee Samuel Finn, Joshua Smith, Brian O'Reilly, Duncan Brown, Bruce Allen, M.Alessandra Papa, Chris Messenger, Carsten Aulbert, and David Tanner
- Subjects
Physics and Astronomy (miscellaneous) - Published
- 2004
44. Swift pointing and gravitational-wave bursts from gamma-ray burst events
- Author
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P. J. Sutton, Badri Krishnan, and Lee Samuel Finn
- Subjects
Physics ,Physics and Astronomy (miscellaneous) ,Gravitational wave ,Astrophysics::High Energy Astrophysical Phenomena ,Detector ,Astronomy ,Astrophysics ,LIGO ,law.invention ,Telescope ,Gravitation ,Black hole ,General Relativity and Quantum Cosmology ,law ,Figure of merit ,Gamma-ray burst - Abstract
The currently accepted model for gamma-ray burst phenomena involves the violent formation of a rapidly rotating solar-mass black hole. Gravitational waves should be associated with the black-hole formation, and their detection would permit this model to be tested. Even upper limits on the gravitational-wave strength associated with gamma-ray bursts could constrain the gamma-ray burst model. This requires joint observations of gamma-ray burst events with gravitational and gamma-ray detectors. Here we examine how the quality of an upper limit on the gravitational-wave strength associated with gamma-ray bursts depends on the relative orientation of the gamma-ray-burst and gravitational-wave detectors, and apply our results to the particular case of the Swift Burst-Alert Telescope (BAT) and the LIGO gravitational-wave detectors. A result of this investigation is a science-based 'figure of merit' that can be used, together with other mission constraints, to optimize the pointing of the Swift telescope for the detection of gravitational waves associated with gamma-ray bursts.
- Published
- 2003
45. No statistical excess in EXPLORER/NAUTILUS observations in the year 2001
- Author
-
Lee Samuel Finn
- Subjects
Physics ,Gravitational-wave observatory ,Physics and Astronomy (miscellaneous) ,biology ,Physics::Instrumentation and Detectors ,Gravitational wave ,Astrophysics (astro-ph) ,Detector ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) ,Astrophysics ,Galactic plane ,equipment and supplies ,Poisson distribution ,biology.organism_classification ,General Relativity and Quantum Cosmology ,symbols.namesake ,Coincident ,symbols ,Sensitivity (control systems) ,Nautilus - Abstract
A recent report on gravitational wave detector data from the NAUTILUS and EXPLORER detector groups claims a statistically significant excess of coincident events when the detectors are oriented in a way that maximizes their sensitivity to gravitational wave sources in the galactic plane. While not claiming a detection of gravitational waves, they do strongly suggest that the origin of the excess is of gravitational wave origin. In this note we show that the statistical analysis that led them to the conclusion that there is a statistical excess is flawed and that the reported observation is entirely consistent with the normal Poisson statistics of the reported detector background., 11 pages, 3 figures, to appear in CQG
- Published
- 2003
46. Physical response of light-time gravitational wave detectors
- Author
-
Lee Samuel Finn and M. Koop
- Subjects
Physics ,Nuclear and High Energy Physics ,Gravitational-wave observatory ,Einstein Telescope ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,Gravitational wave ,Speed of gravity ,Gravitational acceleration ,01 natural sciences ,Gravitational energy ,General Relativity and Quantum Cosmology ,Classical mechanics ,Gravitational field ,0103 physical sciences ,High Energy Physics::Experiment ,010306 general physics ,Gravitational redshift - Abstract
Gravitational wave detectors are typically described as responding to gravitational wave metric perturbations, which are gauge-dependent and --- correspondingly --- unphysical quantities. This is particularly true for ground-based interferometric detectors, like LIGO, space-based detectors, like LISA and its derivatives, spacecraft doppler tracking detectors, and pulsar timing arrays detectors. The description of gravitational waves, and a gravitational wave detector's response, to the unphysical metric perturbation has lead to a proliferation of false analogies and descriptions regarding how these detectors function, and true misunderstandings of the physical character of gravitational waves. Here we provide a fully physical and gauge invariant description of the response of a wide class of gravitational wave detectors in terms of the Riemann curvature, the physical quantity that describes gravitational phenomena in general relativity. In the limit of high frequency gravitational waves, the Riemann curvature separates into two independent gauge invariant quantities: a "background" curvature contribution and a "wave" curvature contribution. In this limit the gravitational wave contribution to the detector response reduces to an integral of the gravitational wave contribution of the curvature along the unperturbed photon path between components of the detector. The description presented here provides an unambiguous physical description of what a gravitational wave detector measures and how it operates, a simple means of computing corrections to a detectors response owing to general detector motion, a straightforward way of connecting the results of numerical relativity simulations to gravitational wave detection, and a basis for a general and fully relativistic pulsar timing formula.
- Published
- 2014
47. Gravitational Wave Hotspots: Ranking Potential Locations of Single-Source Gravitational Wave Emission
- Author
-
B Christy, Andrea N. Lommen, Fredrick A. Jenet, Ben Stappers, Joseph Simon, Lee Samuel Finn, and Abigail Polin
- Subjects
Physics ,Supermassive black hole ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Gravitational wave ,media_common.quotation_subject ,Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics::Instrumentation and Methods for Astrophysics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Probability density function ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Galaxy ,Universe ,Pulsar ,Space and Planetary Science ,Sky ,Galaxy cluster ,Astrophysics::Galaxy Astrophysics ,Astrophysics - Cosmology and Nongalactic Astrophysics ,media_common - Abstract
The steadily improving sensitivity of pulsar timing arrays (PTAs) suggests that gravitational waves (GWs) from supermassive black hole binary (SMBHB) systems in the nearby universe will be de- tectable sometime during the next decade. Currently, PTAs assume an equal probability of detection from every sky position, but as evidence grows for a non-isotropic distribution of sources, is there a most likely sky position for a detectable single source of GWs? In this paper, a collection of galactic catalogs is used to calculate various metrics related to the detectability of a single GW source resolv- able above a GW background, assuming that every galaxy has the same probability of containing a SMBHB. Our analyses of these data reveal small probabilities that one of these sources is currently in the PTA band, but as sensitivity is improved regions of consistent probability density are found in predictable locations, specifically around local galaxy clusters., Comment: 9 pages, 9 figures, accepted for submission in ApJ
- Published
- 2014
- Full Text
- View/download PDF
48. Improved Upper Limits on the Stochastic Gravitational-Wave Background from 2009-2010 LIGO and Virgo Data
- Author
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Joseph Gleason, V. Fafone, B. Behnke, Riccardo Sturani, G. M. Harry, K. Venkateswara, M. Factourovich, Kendall Ackley, R. K. Nayak, Archana Pai, F. Magaña-Sandoval, G. Vedovato, D. B. Kozak, T. B. Edo, Yuri Levin, C. Vorvick, J. Steinlechner, F. Garufi, J. Betzwieser, L. Pinard, Antoine Heidmann, F. Paoletti, P. Ruggi, Robert Stone, A. Di Virgilio, E. Cesarini, R. Chakraborty, B. E. Aylott, H. Overmier, M. Jacobson, Saps Buchman, Maik Frede, Peter Fritschel, A. R. Williamson, Vuk Mandic, W. Katzman, M. Branchesi, J. C. Batch, Albert Lazzarini, R. De Rosa, Th. S. Bauer, M. Neri, K. Kokeyama, N. D. Smith-Lefebvre, J. Calderón Bustillo, S. Márka, J. A. Giaime, Y. M. Kim, J. Birch, D. J. Hosken, E. Coccia, B. A. Weaver, J. G. Rollins, L.-W. Wei, N. Mazumder, E. A. Quintero, Shaun Hooper, Richard O'Shaughnessy, B. Barr, Malik Rakhmanov, J. Worden, Ettore Majorana, P. Ehrens, J. B. Lewis, L. Williams, A. Rüdiger, A. Le Roux, D. S. Rabeling, Sunil Susmithan, T. Accadia, Tyson Littenberg, Pierre-François Cohadon, Saranya Ghosh, K. Loew, D. Sellers, J. Meidam, A. Corpuz, K. A. Hodge, R. Coyne, Xing-Jiang Zhu, B. J. J. Slagmolen, Hee-Suk Cho, I. Nardecchia, Chiara M. F. Mingarelli, Riccardo Bassiri, Kenneth A. Strain, A. Kremin, C. C. Yancey, John A. Clark, Ben Farr, Christophe Collette, Ho-Gyu Lee, T. Vo, C. Bradaschia, P. Oppermann, Michele Vallisneri, Ik Siong Heng, D. Passuello, G. Mendell, V. Malvezzi, Timothy MacDonald, L. Kuo, H. Yamamoto, H. R. Paris, J. Prasad, C. Aulbert, R. Cavalieri, S. Steplewski, Roland Schilling, Hyun Lee, M. Pichot, Enrico Calloni, G. Traylor, Thomas Corbitt, C. A. Costa, W. G. Anderson, G. Cella, Giacomo Ciani, A. Mullavey, B. P. Abbott, E. K. Gustafson, K. E. Gushwa, Rocco Romano, Markus A. Wimmer, John D. Scott, Jordan Camp, E. Rhoades, Carlos Cepeda, Robert J. McCarthy, Linqing Wen, H. Kaufer, A. R. Wade, G. Kuehn, C. M. Mow-Lowry, D. Feldbaum, M. Bitossi, N. Letendre, C. J. Bell, G. Bergmann, Fabio Marchesoni, P. Hello, Kyungmin Kim, B. O'Reilly, G. Quiroga, Yi Pan, D. Hoak, D. Sentenac, Patrick Brady, V. Litvine, S. Chung, M. E. Normandin, K. Wette, E. Maros, Steven Bloemen, I. Di Palma, D. Lodhia, Neil Gehrels, S. Vass, R. Vincent-Finley, W. Z. Korth, John J. Oh, Fabrice Matichard, R. Lynch, D. Rosińska, Timothy Evans, C. Osthelder, Carl-Johan Haster, N. Morgado, L. Rolland, Tobias Westphal, D. L. Kinzel, Rana X. Adhikari, W. Kells, K. Williams, A. Basti, Ludovico Carbone, P. Couvares, Benno Willke, Z. Frei, B. F. Whiting, Jonathan R. Gair, N. A. Lockerbie, Karel E. Urbanek, D. O. Bridges, Rebecca Fisher, K. E. Ramirez, P. Astone, A. K. Zadrożny, Rory Smith, C. Adams, V. Boschi, Joseph D. Romano, E. Oelker, R. A. Mercer, S. P. Tarabrin, J. C. Barayoga, David Jones, Fabrizio Barone, M. Mohan, N. Man, H. J. Jang, K. Haughian, L. K. Nuttall, K. Mason, Sanjeev Dhurandhar, M. Blom, D. Sigg, S. W. Ballmer, B. Machenschalk, F. 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Dereli, K. Siellez, Howard Pan, Hartmut Grote, Farhan Feroz, N. Mangini, A. L. Stuver, T. Denker, James Whelan, P. Ajith, F. Y. Khalili, G. Mazzolo, M. Cordier, J. Aasi, Jade Powell, V. Mangano, Xavier Siemens, L. Naticchioni, R. Abbott, Salvatore Vitale, S. H. Huttner, D. R. Ingram, G. Losurdo, G. Manca, Ilya Mandel, C. Belczynski, M. A. Barton, E. J. King, B. M. Levine, A. L. Urban, M. J. Cowart, S. Dossa, A. Di Lieto, E. J. Daw, A. Allocca, G. Valdes, N. Leroy, David H. Shoemaker, Ajay Kumar, David H. Reitze, A. Ain, Yi-Ming Hu, Grant David Meadors, M. T. Hartman, V. Kringel, A. Viceré, S. Gras, D. Simakov, Yi Chen, M. A. Bizouard, Sweta Shah, Sascha Husa, I. Yakushin, F. Brückner, D. B. Kelley, D. Bersanetti, F. Marion, Zhihui Du, J. V. van Heijningen, L. Sammut, Neil J. Cornish, Jonathan F. Stebbins, T. Etzel, Stephen S. Eikenberry, Nergis Mavalvala, I. Maksimovic, J. Marque, Jerome Degallaix, A. Staley, F. Cleva, R. L. Ward, G. Hemming, Kipp Cannon, Andrew Melatos, M. Lorenzini, Meng Wang, F. Frasconi, S. J. Chamberlin, M. Vasúth, Federico Ferrini, G. Vajente, S. Goßler, M. Kasprzack, Tristan Briant, Paolo Addesso, K. D. Giardina, C. R. Ramet, R. Flaminio, J.-P. Coulon, H. P. Daveloza, V. Loriette, G. Debreczeni, Peter Aufmuth, Francesco Salemi, L. Bonelli, J. Slutsky, S. Mitra, Jiayi Qin, A. Singer, B. C. Barish, V. Kondrashov, R. S. Ottens, Marilyne Andersen, J. N. Marx, C. Gill, Tomasz Bulik, T. T. Fricke, François Bondu, J. Logue, M. Was, P. Kwee, K. A. Thorne, Eric Thrane, Eric W. James, C. Michel, Rosa Poggiani, E. Schreiber, Ryan DeRosa, C. L. Mueller, Karoline Wiesner, A. Alemic, Y. Minenkov, S. M. Koehlenbeck, Richard A. Matzner, Jeffery Kline, Xuan Wang, Matthew Evans, B. C. Stephens, J. P. Zendri, T. Isogai, Fausto Acernese, J. D. Lough, P. J. Sutton, Fan Zhang, J. H. Romie, N. A. Gordon, Sarah Caudill, R. Quitzow-James, R. Day, F. Ohme, G. Kang, C. Celerier, V. Re, B. Moe, H. Wittel, S. Farinon, Odylio D. Aguiar, Kevin M. Ryan, R. J. S. Greenhalgh, Gavin Davies, L. Cunningham, R. Douglas, F. J. Raab, P. Leaci, A. Colla, D. Nolting, A. M. Sintes, R. Essick, P. Puppo, E. Goetz, S. Penn, R. Inta, S. Klimenko, P. J. Veitch, C. Gray, M. Mantovani, A. Giazotto, L. R. Cominsky, R. Gustafson, M. P. Thirugnanasambandam, Laura Cadonati, M. Born, K. Mailand, P. Shawhan, Jessica McIver, I. Ferrante, C. Mishra, S. D'Antonio, Alexander Khalaidovski, Chris Pankow, A. Chiummo, Matthew Heintze, S. Verma, A. Mytidis, H. Vocca, Eugeniy E. Mikhailov, T. M. C. Abbott, J. C. Driggers, L. Austin, Michael Thomas, Marco Aurelio Diaz, P. Charlton, Anton B. Ivanov, J. Bauchrowitz, M. Tonelli, Larry R. Price, N. A. Robertson, Susan M. Scott, P. Raffai, M. Pickenpack, J. Hanks, László Gondán, S. Van Der Putten, Huan Yang, Koji Arai, Katrin Dahl, S. G. Crowder, Satya Mohapatra, M. Leonardi, J. R. Sanders, V. Dattilo, R. Mittleman, R. Goetz, C. Bogan, Tarun Souradeep, A. Donath, Edwin J. Son, Lee Samuel Finn, F. 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Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), (Astro)-Particles Physics, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), LIGO - California Institute of Technology, Louisiana State University, CNRS/IN2P3, Complesso Universitario di Monte sant'Angelo, Università di Salerno, University of Florida, LIGO - Livingston Observatory, Cardiff University, Max-Planck-Institut für Gravitationsphysik, Science Park, LIGO - Massachusetts Institute of Technology, 12227-010 São José Dos Campos, Inter-University Centre for Astronomy and Astrophysics, Tata Institute for Fundamental Research, Syracuse University, University of Wisconsin-Milwaukee, Leibniz Universität Hannover, Sezione di Pisa, Università di Siena, Stanford University, University of Mississippi, California State University Fullerton, Sezione di Roma, University of Birmingham, Montana State University, European Gravitational Observatory (EGO), LIGO - Hanford Observatory, University of Glasgow, Sorbonne Paris Cité, Columbia University, Università di Pisa, CAMK-PAN, Astronomical Observatory Warsaw University, Sezione di Genova, Università Degli Studi di Genova, San Jose State University, Lomonosov Moscow State University, IN2P3/CNRS, NASA/Goddard Space Flight Center, University of Western Australia, Radboud University Nijmegen, Observatoire de la Côte d'Azur, CNRS, Université de Lyon, Washington State University, Sezione di Perugia, Sezione di Firenze, Università Degli Studi di Urbino 'Carlo Bo', University of Oregon, Université Pierre et Marie Curie, VU University Amsterdam, University of Maryland, University of Massachusetts - Amherst, Universitat de les Illes Balears, University of Toronto, Tsinghua University, University of Michigan, Rochester Institute of Technology, Sezione di Roma Tor Vergata, National Tsing Hua University, Charles Sturt University, Caltech-CaRT, Pusan National University, Australian National University, Carleton College, Gran Sasso Science Institute, Università di Roma Tor Vergata, Università di Roma 'La Sapienza', University of Brussels, Sonoma State University, Embry-Riddle Aeronautical University, George Washington University, University of Cambridge, Northwestern University, University of Minnesota, University of Texas at Brownsville, University of Sheffield, RMKI, University of Sannio at Benevento, Gruppo Collegato di Trento, Università di Trento, Montclair State University, Pennsylvania State University, 'Lendulet' Astrophysics Research Group, Università di Perugia, HSIC, Perimeter Institute for Theoretical Physics, American University, University of Adelaide, Raman Research Institute, Korea Institute of Science and Technology Information, Biał Ystok University, University of Southampton, CET Campus, Institute of Applied Physics, Seoul National University, Hanyang University, IM-PAN, NCBJ, Institute for Plasma Research, University of Melbourne, Sezione di Padova, Monash University, University of Strathclyde, Cordoba, Dipartimento di Fisica, University of Texas at Austin, Southern University and AandM College, College of William and Mary, IISER-Kolkata, National Institute for Mathematical Sciences, Hobart and William Smith Colleges, Madhya Pradesh, University of the West of Scotland, Institute of Astronomy, Gujarat, Universidade Estadual Paulista (UNESP), Andrews University, Trinity University, University of Washington, Southeastern Louisiana University, Abilene Christian University, Aasi, J., Abbott, B. ?. 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S., Klimenko, S., Kline, J., Koehlenbeck, S., Kokeyama, K., Kondrashov, V., Koranda, S., Korth, W. ?. Z., Kowalska, I., Kozak, D. ?. B., Kremin, A., Kringel, V., Kr?lak, A., Kuehn, G., Kumar, A., Kumar, P., Kumar, R., Kuo, L., Kutynia, A., Kwee, P., Landry, M., Lantz, B., Larson, S., Lasky, P. ?. D., Lawrie, C., Lazzarini, A., Lazzaro, C., Leaci, P., Leavey, S., Lebigot, E. ?. O., Lee, C. H., Lee, H. ?. K., Lee, H. ?. M., Lee, J., Leonardi, M., Leong, J. ?. R., Le Roux, A., Leroy, N., Letendre, N., Levin, Y., Levine, B., Lewis, J., T. ?. G. ?. F., Li, Libbrecht, K., Libson, A., Lin, A. ?. C., Littenberg, T. ?. B., Litvine, V., Lockerbie, N. ?. A., Lockett, V., Lodhia, D., Loew, K., Logue, J., Lombardi, A. ?. L., Lorenzini, M., Loriette, V., Lormand, M., Losurdo, G., Lough, J., Lubinski, M. ?. J., L?ck, H., Luijten, E., Lundgren, A. ?. P., Lynch, R., Ma, Y., Macarthur, J., Macdonald, E. ?. P., Macdonald, T., Machenschalk, B., Macinnis, M., Macleod, D. ?. M., Magana Sandoval, F., Mageswaran, M., Maglione, C., Mailand, K., Majorana, E., Maksimovic, I., Malvezzi, V., Man, N., Manca, G. ?. M., Mandel, I., Mandic, V., Mangano, V., Mangini, N., Mantovani, M., Marchesoni, F., Marion, F., M?rka, S., M?rka, Z., Markosyan, A., Maros, E., Marque, J., Martelli, F., Martin, I. ?. W., Martin, R. ?. M., Martinelli, L., Martynov, D., Marx, J. ?. N., Mason, K., Masserot, A., Massinger, T. ?. J., Matichard, F., Matone, L., Matzner, R. ?. A., Mavalvala, N., Mazumder, N., Mazzolo, G., Mccarthy, R., Mcclelland, D. ?. E., Mcguire, S. ?. C., Mcintyre, G., Mciver, J., Mclin, K., Meacher, D., Meadors, G. ?. D., Mehmet, M., Meidam, J., Meinders, M., Melatos, A., Mendell, G., Mercer, R. ?. A., Meshkov, S., Messenger, C., Meyers, P., Miao, H., Michel, C., Mikhailov, E. ?. E., Milano, Leopoldo, Milde, S., Miller, J., Minenkov, Y., Mingarelli, C. ?. M. ?. F., Mishra, C., Mitra, S., Mitrofanov, V. ?. 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[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE] ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,[SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] ,media_common.quotation_subject ,Astronomy ,General Physics and Astronomy ,FOS: Physical sciences ,LIGO data ,Astrophysics ,General Relativity and Quantum Cosmology (gr-qc) ,[ PHYS.ASTR.CO ] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] ,Omega ,04.80.Cc ,Cosmology ,General Relativity and Quantum Cosmology ,[ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] ,Gravitational wave background ,[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] ,Detection of gravitational wave ,95.85.Sz ,04.30.-w ,04.80.Nn ,Physics and Astronomy (all) ,Settore FIS/05 - Astronomia e Astrofisica ,INFLATION ,SDG 7 - Affordable and Clean Energy ,media_common ,Physics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Spectral index ,Gravitational wave ,[SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE] ,Settore FIS/01 - Fisica Sperimentale ,Gravitational-Wave ,Spectral density ,Stochastic background ,[ PHYS.ASTR.HE ] Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE] ,Universe ,LIGO ,Virgo data ,[ SDU.ASTR.CO ] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] ,ComputingMethodologies_DOCUMENTANDTEXTPROCESSING ,[PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] ,RADIATION ,[ SDU.ASTR.HE ] Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE] ,Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Gravitational waves from a variety of sources are predicted to superpose to create a stochastic background. This background is expected to contain unique information from throughout the history of the universe that is unavailable through standard electromagnetic observations, making its study of fundamental importance to understanding the evolution of the universe. We carry out a search for the stochastic background with the latest data from LIGO and Virgo. Consistent with predictions from most stochastic gravitational-wave background models, the data display no evidence of a stochastic gravitational-wave signal. Assuming a gravitational-wave spectrum of Omega_GW(f)=Omega_alpha*(f/f_ref)^alpha, we place 95% confidence level upper limits on the energy density of the background in each of four frequency bands spanning 41.5-1726 Hz. In the frequency band of 41.5-169.25 Hz for a spectral index of alpha=0, we constrain the energy density of the stochastic background to be Omega_GW(f), 11 pages, 2 figures, 1 table
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- 2014
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49. Constraints on Cosmic Strings from the LIGO-Virgo Gravitational-Wave Detectors
- Author
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F. Kawazoe, T. Huynh-Dinh, S. Kandhasamy, Marc Favata, L. E. Wade, Roger Jones, M. C. Díaz, M. Rodruck, D. D. Brown, F. Travasso, Michał Bejger, I. Yakushin, A. Effler, C. I. Torrie, F. Brückner, A. Perreca, G. Gemme, D. Moraru, S. J. Waldman, Gianpietro Cagnoli, M. Drago, D. Yeaton-Massey, Atsushi J. Nishizawa, H. J. Bulten, J. B. Kanner, A. M. Sergeev, G. Traylor, S. Doravari, Igor Neri, Innocenzo M. Pinto, Matthew West, R. Conte, Namjun Kim, Roy Williams, Michael E Zucker, D. Barker, H. P. Daveloza, N. Morgado, S. Roddy, Tristan Briant, Jeffery Kline, Xuan Wang, J. D. Lough, P. Aufmuth, Lee Samuel Finn, J. Poeld, A. Królak, R. Frey, Duncan Meacher, P. J. King, B. Shapiro, M. Heurs, Tania Regimbau, M. M. Hanke, K. Grover, K. Izumi, Alexander Khalaidovski, L. Bonelli, J. Slutsky, S. B. Anderson, Rana X. Adhikari, L. Cunningham, Ruslan Vaulin, David B. Tanner, J. C. Dumas, F. Jiménez-Forteza, F. Vetrano, Karoline Wiesner, Jong H. Chow, Bala R. Iyer, A. Pasqualetti, Chris Pankow, A. Chiummo, M. V. Van Der Sluys, P. Shawhan, F. Donovan, R. McCarthy, Michael W. Coughlin, Piotr Jaranowski, Florent Robinet, J. Macarthur, S. E. Dwyer, David Keitel, C. Graef, M. Tse, M. Boer, D. B. Kelley, D. M. Macleod, B. L. Swinkels, F. Carbognani, V. Malvezzi, M. Britzger, C. Roever, M. P. Thirugnanasambandam, Tobias Eberle, Luca Gammaitoni, A. Cumming, Tenglin Li, C. Buy, S. Dhurandhar, B. M. Levine, P. Fulda, R. S. Ottens, L. Pinard, I. Kowalska, M. A. Barton, C. Aulbert, Scott Koranda, L. Matone, Timothy A Welborn, A. F. Brooks, A. J. Weinstein, Imre Bartos, Stefaan Franco, V. Quetschke, Bangalore Suryanarayana Sathyaprakash, Maria Alessandra Papa, A. Di Lieto, M. Vasúth, E. Foley, S. Giampanis, F. Cavalier, M. Mageswaran, C. Palomba, S. Privitera, M. S. Shahriar, Ludovico Carbone, P. Couvares, Benno Willke, J. Clark, Carl L. Rodriguez, R. Kurdyumov, H. Fehrmann, L. Tang, G. Manca, G. McIntyre, Roman Schnabel, Suvadeep Bose, Z. Márka, B. Canuel, A. A. van Veggel, L. Martinelli, Subhasish Mitra, Efim A. Khazanov, G. Ballardin, Moritz Mehmet, C. Lawrie, E. Genin, Sascha Husa, Collin Capano, M. Bebronne, P. T. Baker, L. Naticchioni, Salvatore Vitale, T. Z. Summerscales, Meng Wang, A. Stochino, A. Singer, S. Ast, S. Raja, S. E. Strigin, A. Brillet, S. P. Vyachanin, Zhihui Du, M. Brinkmann, S. Frasca, S. Kudla, L. Rolland, Rosa Poggiani, E. Black, J. R. Smith, T. Nash, W. Kells, Leo Singer, Alberto Vecchio, K. Kokeyama, N. D. Smith-Lefebvre, Benjamin William Allen, G. Szeifert, Karsten Danzmann, E. Maros, M. Phelps, Fabrizio Barone, M. Mohan, G. H. Ogin, M. A. Bizouard, C. M. Reed, S. Farinon, J. N. Marx, Alessandra Buonanno, K. A. Thorne, László Á. Gergely, M. Colombini, C. Gray, J. Calderón Bustillo, K. Soden, S. M. Scott, Grant David Meadors, Eric Howell, Stephen Fairhurst, A. Kumar, N. Man, L. Prokhorov, Will M. Farr, D. Sellers, Alessandra Corsi, E. J. King, J. Eichholz, D. Sigg, J. M. Berliner, T. Williams, Nancy Aggarwal, A. Dietz, F. Frasconi, A. S. Stroeer, J. Zweizig, R. Essick, P. Puppo, C. R. Ramet, R. Flaminio, V. Re, P. Kwee, T. Etzel, Michael Landry, W. Z. Korth, Fanghua Liu, A. L. Stuver, M. J. Cowart, F. Mokler, L. K. Nuttall, Samuel Deléglise, L. Wallace, P. Raffai, D. R. Ingram, V. Sandberg, Patrice Hello, M. Pickenpack, E. J. Daw, F. Clara, D. Fazi, M. Punturo, J. Birch, David Coward, H. J. Jang, K. Haughian, S. Gras, Sheon Chua, C. J. Guido, J. Hanks, R. Bonnand, L. Sperandio, S. Gil-Casanova, Máté Nagy, Sebastian Steinlechner, F. Magana-Sandoval, J. Ou, Nergis Mavalvala, Jerome Degallaix, E. Coccia, Denis Martynov, G. Billingsley, S. Van Der Putten, L. Bosi, M. Holtrop, Travis Horrom, Katrin Dahl, N. A. Gordon, P. J. Veitch, Q. Chu, Yunchao Liu, Sanichiro Yoshida, J. S. Areeda, B. A. Weaver, M. Zanolin, B. Hughey, V. Huang, H. Dereli, K. Siellez, J. S. Kissel, J. Iafrate, B. Moe, L.-W. Wei, J. Garcia, Federico Ferrini, G. Vajente, Graham Woan, Gregory M. Harry, Robert L. Byer, C. Osthelder, G. S. Davies, J. Betzwieser, C. Gill, G. Rajalakshmi, L. Sammut, Fan Zhang, Andrew Melatos, M. Lorenzini, A. Masserot, B. Schulz, Kazuhiro Hayama, C. S. Unnikrishnan, Odylio D. Aguiar, F. Marion, C. J. Bell, Tobias Westphal, László Gondán, S. E. Whitcomb, R. DeSalvo, B. R. Hall, P. G. Murray, N. Zotov, D. O. Bridges, Rebecca Fisher, Rainer Weiss, F. Ricci, R. W. P. Drever, W. D. Vousden, P. J. Sutton, N. Straniero, P. Thomas, David Jones, John Miller, M. Fyffe, Kip S. Thorne, T. Prestegard, D. Nanda Kumar, Erik Katsavounidis, Bernard F. Schutz, Li Ju, Lutz Winkelmann, M. Branchesi, Paul J. Groot, V. Loriette, Ruth A. Anderson, J. C. Batch, S. E. Gossan, E. Deleeuw, Daniel A. Shaddock, N. Letendre, D. Talukder, R. Goetz, Y. Minenkov, K. Mason, T. Chalermsongsak, Alessandro Bertolini, R. Cavalieri, Theodore S. Hong, D. Ugolini, Prayush Kumar, K. A. Hodge, C. L. Mueller, C. Tomlinson, E. A. Quintero, T. Reed, A. Gennai, M. J. Lubinski, Francesco Salemi, B. Behnke, R. M S Schofield, K. Evans, C. Bogan, Tarun Souradeep, Guido Mueller, Marco Cavaglia, A. Nitz, Ryan DeRosa, John Veitch, Ilya Belopolski, S. M. Aston, C. V. Torres, I. W. Harry, E. Amador Ceron, Xin Chen, R. M. Martin, E. Steinert, Riccardo Sturani, R. Chakraborty, A. M. Sintes, Riccardo Paoletti, R. Gustafson, K. Venkateswara, David Murphy, V. P. Mitrofanov, Rajesh Kumar, D. Bersanetti, Vladimir B. Braginsky, Hsiang-Chuan Liu, N. A. Robertson, Drew Keppel, M. Edwards, H. Vahlbruch, B. Sorazu, J. V. van Heijningen, J. Abadie, J. K. Blackburn, S. Meshkov, A. L. Lombardi, M. Lormand, E. Chassande-Mottin, Y. Wan, M. Damjanic, Gabriela Gonzalez, S. Verma, A. Castiglia, M. MacInnis, B. E. Aylott, Philip Graff, P. Rapagnani, M. C. Araya, H. Wittel, A. Basti, J. Bowers, R. De Rosa, W. Del Pozzo, P. F. Cohadon, Trevor Sidery, H. Heitmann, R. Gouaty, Eric Thrane, D. J. Hosken, Robert Stone, A. Mytidis, D. Hammer, V. Predoi, I. W. Martin, Andrea Chincarini, Jessica McIver, J. Y. Vinet, N. Fotopoulos, M. Vallisneri, W. W. Johnson, A. Rocchi, F. Fidecaro, G. M. Guidi, F. Martelli, K. Riles, V. Brisson, Sheila Rowan, Andreas Freise, O. Puncken, Paul D. Lasky, Joshua L. Willis, Takehiko Mori, Matthew Pitkin, Matthew Heintze, J.-P. Coulon, Joshua Yablon, Z. Frei, David E. McClelland, A. Di Virgilio, S. D'Antonio, Eric W. James, C. Michel, H. Yamamoto, W. Ortega Larcher, K. Dmitry, E. A. Huerta, W. Katzman, R. J.E. Smith, Archana Pai, Benjamin J. Owen, F. Paoletti, E. Goetz, J. F. J. van den Brand, Vivien Raymond, Peter R. Saulson, Gijs Nelemans, Jian-Siung Wang, P. Leaci, A. Colla, J. G. Rollins, E. D. Hall, Jolien D. E. Creighton, G. Mendell, M. Tacca, A. Viceré, Martin Hendry, M. Wade, V. Sannibale, Daniel Vrinceanu, M. Granata, D. Simakov, Yi Chen, F. Garufi, J.-D. Fournier, J. Lee, H. Radkins, Xing-Jiang Zhu, Linqing Wen, Hyun Lee, P. Ruggi, Christopher Wipf, Bartosz Pindor, K. V. Tokmakov, B. Lantz, Ettore Majorana, S. G. Crowder, Sarah Caudill, A. Wanner, D. Nolting, F. J. Raab, R. Quitzow-James, R. Day, E. Nishida, T. M. C. Abbott, E. Cuoco, S. Caride, P. Ehrens, C. Griffo, M. Jacobson, Lindy Blackburn, Todd Adams, Junwei Cao, Evan Ochsner, I. Fiori, B. J. J. Slagmolen, Christian D. Ott, Hee-Suk Cho, S. T. Countryman, V. Lhuillier, P. T. Beyersdorf, V. Boschi, Fabien Kéfélian, J. H. Hough, J. C. Driggers, R. Bork, K. Haris, Chiara M. F. Mingarelli, E. O. Lebigot, Satya Mohapatra, Peter Kalmus, J. B. Lewis, Maria Ilaria Del Principe, M. Agathos, F. Ohme, B. Daudert, S. R. Morriss, L. Austin, K. Holt, K. Kawabe, Shiuh Chao, Gleb Romanov, Chunglee Kim, V. Necula, Vuk Mandic, Chunnong Zhao, Richard O'Shaughnessy, B. Barr, M. G. Beker, S. Wibowo, C. Kucharczyk, Malik Rakhmanov, Michael Thomas, J. Worden, H. Zhu, Sunil Susmithan, I. Di Palma, D. Lodhia, Neil Gehrels, I. Santiago-Prieto, David H. Shoemaker, C. Messenger, M. Bitossi, J. R. Sanders, G. Bergmann, K. Wette, M. Prijatelj, Qi Fang, John J. Oh, D. S. Rabeling, K. E. Gushwa, L. Williams, D. Verkindt, Huan Yang, S. Márka, L. Di Fiore, B. Mours, T. Accadia, Riccardo Bassiri, M. Barsuglia, A. Rüdiger, Th. S. Bauer, A. Le Roux, A. K. Zadrożny, J. R. Leong, S. H. Huttner, Koji Arai, F. Cleva, T. J. Massinger, T. Vo, V. Lockett, C. Adams, V. Litvine, Rocco Romano, Markus A. Wimmer, A. P. M. ter Braack, Tyson Littenberg, D. Passuello, K. D. Giardina, M. Neri, Matthew Abernathy, Kasem Mossavi, A. Lazzarini, N. Leroy, M. T. Hartman, E. Forsi, S. W. Ballmer, C. Padilla, D. Bessis, V. V. Frolov, Mark S. Meyer, R. Riesen, John D. Scott, D. L. Kinzel, A. Grant, V. Kringel, R. A. Mercer, Leopoldo Milano, H. Kaufer, Y. M. Kim, Jan Harms, A. S. Sengupta, G. May, S. Chung, Benoit Sassolas, J. E. Brau, F. Seifert, P. Campsie, Michelle E. Walker, S. Goßler, J. A. Giaime, Charlotte Bond, G. D. Hammond, C. A. Brannen, Stanislav Babak, J. Heefner, M. Kasprzack, Honam Yum, A. R. Wade, Peter Fritschel, C. Affeldt, G. Debreczeni, M. E. Normandin, Shaun Hooper, Ben Farr, A. W. Heptonstall, M. Constancio, Duncan A. Brown, G. Kuehn, C. M. Mow-Lowry, D. Rosińska, S. Vass, J. H. Romie, M. Yvert, S. P. Tarabrin, Ho-Gyu Lee, Joseph Gleason, J. C. Barayoga, S. Foley, E. Schreiber, D. L. Jones, Richard J. Abbott, J. Luan, D. Hoak, H. R. Paris, V. Fafone, Michael L. Gorodetsky, S. Klimenko, R. K. Nayak, Tomasz Bulik, W. Winkler, M. A. Frei, Saranya Ghosh, Zhen Liu, K. Ryan, G. Moreno, M. Pedraza, D. Buskulic, T. P. Bodiya, J. P. Zendri, G. Kang, E. Saracco, K. Loew, P. Oppermann, O. Torre, Peter Wessels, Kieran Craig, C. Van Den Broeck, Ik Siong Heng, S. Steplewski, R. Taylor, François Bondu, Seog Oh, M. Pichot, M. Blom, R. Kasturi, Jonathan R. Gair, H. Overmier, S. H. Barnum, S. Grunewald, Douglas E. Stevens, Enrico Calloni, A. Giazotto, Thomas Corbitt, C. A. Costa, J. O'Dell, T. Dayanga, N. A. Lockerbie, A. S. Markosyan, I. Ferrante, Jesper Munch, P. Astone, Harald Lück, M. Born, Laura Cadonati, G. Endroczi, S. C. McGuire, Thomas Dent, Fausto Acernese, P. Charlton, P. Peiris, Haixing Miao, S. L. Danilishin, Teviet Creighton, J. Breyer, M. Shaltev, O. Bock, István Rácz, K. L. Dooley, Ilya Mandel, J. Steinlechner, V. Poole, Chad Hanna, James Whelan, P. Ajith, L. Zhang, Shane L. Larson, X. Siemens, M. Cordier, Stephen S. Eikenberry, C. Wilkinson, Lisa Barsotti, Z. Hua, Alessandra Toncelli, I. Maksimovic, M. Mantovani, J. Marque, B. K. Kim, R. Mittleman, R. L. Ward, R. J. G. Jonker, R. Schilling, D. Amariutei, G. Hemming, Nelson Christensen, S. M. Koehlenbeck, F. Nocera, Richard A. Matzner, D. J. White, D. C. Coyne, I. A. Bilenko, V. Dergachev, David J. Ottaway, A. M. Gretarsson, C. Poux, V. Dattilo, Edwin J. Son, Stefan Hild, C. Bradaschia, A. C. Lin, K. Kaufman, Hartmut Grote, Vaibhav Tiwari, D. Schuette, T. Denker, G. Losurdo, Neil J. Cornish, E. Cesarini, Kenneth A. Strain, A. Kremin, Fabio Marchesoni, Kyungmin Kim, Yi Pan, Thanh Vinh Nguyen, David Blair, Jordan Camp, D. Feldbaum, T. Meier, G. Newton, C. Vorvick, R. J. S. Greenhalgh, V. Kondrashov, S. Reid, Anton B. Ivanov, J. Bauchrowitz, Vicky Kalogera, M. Tonelli, Larry R. Price, G. Vedovato, D. B. Kozak, M. Leonardi, D. Cook, G. Mazzolo, A. Staley, J. Hanson, C. Cepeda, Maik Frede, G. R. Skelton, P. Schwinberg, C. C. Yancey, Richard S. Savage, Andrew Lundgren, W. S. Kim, V. Pierro, M. Factourovich, W. G. Anderson, G. Cella, Giacomo Ciani, A. Mullavey, B. P. Abbott, E. K. Gustafson, D. E. Clark, R. Vincent-Finley, B. F. Whiting, Antoine Heidmann, B. Machenschalk, K. Mailand, Matthew Evans, S. Mukherjee, Fabrice Matichard, E. Oelker, A. S. Bell, N. Mazumder, T. Isogai, F. Y. Khalili, J. Meidam, A. Allocca, K. C. Cannon, D. Lloyd, T. T. Fricke, M. Was, H. Vocca, Eugeniy E. Mikhailov, R. Inta, D. Sentenac, Patrick Brady, M. R. Smith, A. Conte, Y. J. Jang, B. O'Reilly, G. Mitselmakher, Seiji Kawamura, T. Bhadbhade, B. Vlcek, Reinhard Prix, Elizabeth Harstad, I. Nardecchia, J. Aasi, V. Mangano, Masa-Katsu Fujimoto, David H. Reitze, Yi-Ming Hu, Sweta Shah, J. Logue, T. Dal Canton, T. Evans, R. Passaquieti, M. Huynh, E. Macdonald, G. A. Prodi, F. Piergiovanni, S. Penn, Chang-Hwan Lee, M. Weinert, M. Davier, C. C. Arceneaux, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), APC - Cosmologie, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Department of Physics, Columbia University [New York], Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des matériaux avancés (LMA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), APC - Gravitation (APC-Gravitation), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Max-Planck-Gesellschaft-Max-Planck-Gesellschaft, Observatoire de la Côte d'Azur (OCA), Centre National de la Recherche Scientifique (CNRS), ESPCI ParisTech, Laboratoire d'Annecy de Physique des Particules (LAPP), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL), Laboratoire d'Annecy de Physique des Particules ( LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ), Physique Corpusculaire et Cosmologie - Collège de France ( PCC ), Collège de France ( CdF ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ) -Collège de France ( CdF ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ) -AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre National de la Recherche Scientifique ( CNRS ) -Observatoire de Paris-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Laboratoire de l'Accélérateur Linéaire ( LAL ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Physique de Rennes ( IPR ), Université de Rennes 1 ( UR1 ), Université de Rennes ( UNIV-RENNES ) -Université de Rennes ( UNIV-RENNES ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire des matériaux avancés ( LMA ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), APC - Gravitation ( APC-Gravitation ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Max-Planck-Institut-Max-Planck-Institut, Observatoire de la Côte d'Azur ( OCA ), Centre National de la Recherche Scientifique ( CNRS ), (Astro)-Particles Physics, Aasi, J., Abadie, J., Abbott, B. ?. P., Abbott, R., Abbott, T., Abernathy, M. ?. R., Accadia, T., Acernese, F., Adams, C., Adams, T., Adhikari, R. ?. X., Affeldt, C., Agathos, M., Aggarwal, N., Aguiar, O. ?. D., Ajith, P., Allen, B., Allocca, A., Amador Ceron, E., Amariutei, D., Anderson, R. ?. A., Anderson, S. ?. B., Anderson, W. ?. G., Arai, K., Araya, M. ?. C., Arceneaux, C., Areeda, J., Ast, S., Aston, S. ?. M., Astone, P., Aufmuth, P., Aulbert, C., Austin, L., Aylott, B. ?. E., Babak, S., Baker, P. ?. T., Ballardin, G., Ballmer, S. ?. W., Barayoga, J. ?. C., Barker, D., Barnum, S. ?. H., Barone, F., Barr, B., Barsotti, L., Barsuglia, M., Barton, M. ?. A., Bartos, I., Bassiri, R., Basti, A., Batch, J., Bauchrowitz, J., Bauer, T. h. S., Bebronne, M., Behnke, B., Bejger, M., Beker, M. ?. G., Bell, A. ?. S., Bell, C., Belopolski, I., Bergmann, G., Berliner, J. ?. M., Bersanetti, D., Bertolini, A., Bessis, D., Betzwieser, J., Beyersdorf, P. ?. T., Bhadbhade, T., Bilenko, I. ?. 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S., Daw, E. ?. J., Day, R., Dayanga, T., DE ROSA, Rosario, Debreczeni, G., Degallaix, J., Del Pozzo, W., Deleeuw, E., Del?glise, S., Denker, T., Dent, T., Dereli, H., Dergachev, V., Derosa, R., Desalvo, R., Dhurandhar, S., Di Fiore, L., Di Lieto, A., Di Palma, I., Di Virgilio, A., D?az, M., Dietz, A., Dmitry, K., Donovan, F., Dooley, K. ?. L., Doravari, S., Drago, M., Drever, R. ?. W. ?. P., Driggers, J. ?. C., Du, Z., Dumas, J. C., Dwyer, S., Eberle, T., Edwards, M., Effler, A., Ehrens, P., Eichholz, J., Eikenberry, S. ?. S., Endr?czi, G., Essick, R., Etzel, T., Evans, K., Evans, M., Evans, T., Factourovich, M., Fafone, V., Fairhurst, S., Fang, Q., Farinon, S., Farr, B., Farr, W., Favata, M., Fazi, D., Fehrmann, H., Feldbaum, D., Ferrante, I., Ferrini, F., Fidecaro, F., Finn, L. ?. S., Fiori, I., Fisher, R., Flaminio, R., Foley, E., Foley, S., Forsi, E., Fotopoulos, N., Fournier, J. 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T., Haughian, K., Hayama, K., Heefner, J., Heidmann, A., Heintze, M., Heitmann, H., Hello, P., Hemming, G., Hendry, M., Heng, I. ?. S., Heptonstall, A. ?. W., Heurs, M., Hild, S., Hoak, D., Hodge, K. ?. A., Holt, K., Holtrop, M., Hong, T., Hooper, S., Horrom, T., Hosken, D. ?. J., Hough, J., Howell, E. ?. J., Hu, Y., Hua, Z., Huang, V., Huerta, E. ?. A., Hughey, B., Husa, S., Huttner, S. ?. H., Huynh, M., Huynh Dinh, T., Iafrate, J., Ingram, D. ?. R., Inta, R., Isogai, T., Ivanov, A., Iyer, B. ?. R., Izumi, K., Jacobson, M., James, E., Jang, H., Jang, Y. ?. J., Jaranowski, P., Jim?nez Forteza, F., Johnson, W. ?. W., Jones, D., Jones, D. ?. I., Jones, R., Jonker, R. ?. J. ?. G., Ju, L., Haris, K., Kalmus, P., Kalogera, V., Kandhasamy, S., Kang, G., Kanner, J. ?. B., Kasprzack, M., Kasturi, R., Katsavounidis, E., Katzman, W., Kaufer, H., Kaufman, K., Kawabe, K., Kawamura, S., Kawazoe, F., K?f?lian, F., Keitel, D., Kelley, D. ?. B., Kells, W., Keppel, D. ?. G., Khalaidovski, A., Khalili, F. ?. Y., Khazanov, E. ?. A., Kim, B. ?. K., Kim, C., Kim, K., Kim, N., Kim, W., Kim, Y. M., King, E. ?. J., King, P. ?. J., Kinzel, D. ?. L., Kissel, J. ?. S., Klimenko, S., Kline, J., Koehlenbeck, S., Kokeyama, K., Kondrashov, V., Koranda, S., Korth, W. ?. Z., Kowalska, I., Kozak, D., Kremin, A., Kringel, V., Kr?lak, A., Kucharczyk, C., Kudla, S., Kuehn, G., Kumar, A., Kumar, P., Kumar, R., Kurdyumov, R., Kwee, P., Landry, M., Lantz, B., Larson, S., Lasky, P. ?. D., Lawrie, C., Lazzarini, A., Le Roux, A., Leaci, P., Lebigot, E. ?. O., Lee, C. H., Lee, H. ?. K., Lee, H. ?. M., Lee, J., Leonardi, M., Leong, J. ?. R., Leroy, N., Letendre, N., Levine, B., Lewis, J. ?. B., Lhuillier, V., T. ?. G. ?. F., Li, Lin, A. ?. C., Littenberg, T. ?. B., Litvine, V., Liu, F., Liu, H., Liu, Y., Liu, Z., Lloyd, D., Lockerbie, N. ?. A., Lockett, V., Lodhia, D., Loew, K., Logue, J., Lombardi, A. ?. L., Lorenzini, M., Loriette, V., Lormand, M., Losurdo, G., Lough, J., Luan, J., Lubinski, M. ?. J., L?ck, H., Lundgren, A. ?. P., Macarthur, J., Macdonald, E., Machenschalk, B., Macinnis, M., Macleod, D. ?. M., Magana Sandoval, F., Mageswaran, M., Mailand, K., Majorana, E., Maksimovic, I., Malvezzi, V., Man, N., Manca, G. ?. M., Mandel, I., Mandic, V., Mangano, V., Mantovani, M., Marchesoni, F., Marion, F., M?rka, S., M?rka, Z., Markosyan, A., Maros, E., Marque, J., Martelli, F., Martin, I. ?. W., Martin, R. ?. M., Martinelli, L., Martynov, D., Marx, J. ?. N., Mason, K., Masserot, A., Massinger, T. ?. J., Matichard, F., Matone, L., Matzner, R. ?. A., Mavalvala, N., May, G., Mazumder, N., Mazzolo, G., Mccarthy, R., Mcclelland, D. ?. E., Mcguire, S. ?. C., Mcintyre, G., Mciver, J., Meacher, D., Meadors, G. ?. D., Mehmet, M., Meidam, J., Meier, T., Melatos, A., Mendell, G., Mercer, R. ?. A., Meshkov, S., Messenger, C., Meyer, M. ?. S., Miao, H., Michel, C., Mikhailov, E. ?. E., Milano, Leopoldo, Miller, J., Minenkov, Y., Mingarelli, C. ?. M. ?. F., Mitra, S., Mitrofanov, V. ?. P., Mitselmakher, G., Mittleman, R., Moe, B., Mohan, M., Mohapatra, S. ?. R. ?. P., Mokler, F., Moraru, D., Moreno, G., Morgado, N., Mori, T., Morriss, S. ?. R., Mossavi, K., Mours, B., Mow Lowry, C. ?. M., Mueller, C. ?. L., Mueller, G., Mukherjee, S., Mullavey, A., Munch, J., Murphy, D., Murray, P. ?. G., Mytidis, A., Nagy, M. ?. F., Nanda Kumar, D., Nardecchia, I., Nash, T., Naticchioni, L., Nayak, R., Necula, V., Nelemans, G., Neri, I., Neri, M., Newton, G., Nguyen, T., Nishida, E., Nishizawa, A., Nitz, A., Nocera, F., Nolting, D., Normandin, M. ?. E., Nuttall, L. ?. K., Ochsner, E., O?dell, J., Oelker, E., Ogin, G. ?. H., J. ?. J., Oh, S. ?. H., Oh, Ohme, F., Oppermann, P., O?reilly, B., Ortega Larcher, W., O?shaughnessy, R., Osthelder, C., Ott, C. ?. D., Ottaway, D. ?. J., Ottens, R. ?. S., Ou, J., Overmier, H., Owen, B. ?. J., Padilla, C., Pai, A., Palomba, C., Pan, Y., Pankow, C., Paoletti, F., Paoletti, R., Papa, M. ?. A., Paris, H., Pasqualetti, A., Passaquieti, R., Passuello, D., Pedraza, M., Peiris, P., Penn, S., Perreca, A., Phelps, M., Pichot, M., Pickenpack, M., Piergiovanni, F., Pierro, V., Pinard, L., Pindor, B., Pinto, I. ?. M., Pitkin, M., Poeld, J., Poggiani, R., Poole, V., Poux, C., Predoi, V., Prestegard, T., Price, L. ?. R., Prijatelj, M., Principe, M., Privitera, S., Prix, R., Prodi, G. ?. A., Prokhorov, L., Puncken, O., Punturo, M., Puppo, P., Quetschke, V., Quintero, E., Quitzow James, R., Raab, F. ?. J., Rabeling, D. ?. S., R?cz, I., Radkins, H., Raffai, P., Raja, S., Rajalakshmi, G., Rakhmanov, M., Ramet, C., Rapagnani, P., Raymond, V., Re, V., Reed, C. ?. M., Reed, T., Regimbau, T., Reid, S., Reitze, D. ?. H., Ricci, F., Riesen, R., Riles, K., Robertson, N. ?. A., Robinet, F., Rocchi, A., Roddy, S., Rodriguez, C., Rodruck, M., Roever, C., Rolland, L., Rollins, J. ?. G., Romano, R., Romanov, G., Romie, J. ?. H., Rosi?ska, D., Rowan, S., R?diger, A., Ruggi, P., Ryan, K., Salemi, F., Sammut, L., Sandberg, V., Sanders, J., Sannibale, V., Santiago Prieto, I., Saracco, E., Sassolas, B., Sathyaprakash, B. ?. S., Saulson, P. ?. R., Savage, R., Schilling, R., Schnabel, R., Schofield, R. ?. M. ?. S., Schreiber, E., Schuette, D., Schulz, B., Schutz, B. ?. F., Schwinberg, P., Scott, J., Scott, S. ?. M., Seifert, F., Sellers, D., Sengupta, A. ?. S., Sentenac, D., Sergeev, A., Shaddock, D., Shah, S., Shahriar, M. ?. S., Shaltev, M., Shapiro, B., Shawhan, P., Shoemaker, D. ?. H., Sidery, T. ?. L., Siellez, K., Siemens, X., Sigg, D., Simakov, D., Singer, A., Singer, L., Sintes, A. ?. M., Skelton, G. ?. R., Slagmolen, B. ?. J. ?. J., Slutsky, J., Smith, J. ?. R., Smith, M. ?. R., Smith, R. ?. J. ?. E., Smith Lefebvre, N. ?. D., Soden, K., Son, E. ?. J., Sorazu, B., Souradeep, T., Sperandio, L., Staley, A., Steinert, E., Steinlechner, J., Steinlechner, S., Steplewski, S., Stevens, D., Stochino, A., Stone, R., Strain, K. ?. A., Straniero, N., Strigin, S., Stroeer, A. ?. S., Sturani, R., Stuver, A. ?. L., Summerscales, T. ?. Z., Susmithan, S., Sutton, P. ?. J., Swinkels, B., Szeifert, G., Tacca, M., Talukder, D., Tang, L., Tanner, D. ?. B., Tarabrin, S. ?. P., Taylor, R., ter Braack, A. ?. P. ?. M., Thirugnanasambandam, M. ?. P., Thomas, M., Thomas, P., Thorne, K. ?. A., Thorne, K. ?. S., Thrane, E., Tiwari, V., Tokmakov, K. ?. V., Tomlinson, C., Toncelli, A., Tonelli, M., Torre, O., Torres, C. ?. V., Torrie, C. ?. I., Travasso, F., Traylor, G., Tse, M., Ugolini, D., Unnikrishnan, C. ?. S., Vahlbruch, H., Vajente, G., Vallisneri, M., van den Brand, J. ?. F. ?. J., Van Den Broeck, C., van der Putten, S., van der Sluys, M. ?. V., van Heijningen, J., van Veggel, A. ?. 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C., Yang, H., Yeaton Massey, D., Yoshida, S., Yum, H., Yvert, M., Zadro?ny, A., Zanolin, M., Zendri, J. P., Zhang, F., Zhang, L., Zhao, C., Zhu, H., Zhu, X. ?. J., Zotov, N., Zucker, M. ?. E., Zweizig, J., Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), The LIGO Scientific Collaboration, and The Virgo Collaboration
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Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,[SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] ,Pacs number: 11.27.+d ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,Cosmic microwave background ,Cosmic background radiation ,General Physics and Astronomy ,FOS: Physical sciences ,Astrophysics ,General Relativity and Quantum Cosmology (gr-qc) ,Astrophysics::Cosmology and Extragalactic Astrophysics ,[ PHYS.ASTR.CO ] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] ,String (physics) ,General Relativity and Quantum Cosmology ,Cosmology ,[ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] ,[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] ,LIMITS ,Physics and Astronomy (all) ,INFLATION ,Settore FIS/05 - Astronomia e Astrofisica ,Pacs number: 11.25.Wx ,Nuclear Experiment ,cosmic string ,Pacs number: 04.80 Nn ,gravitational wave ,High Energy Astrophysical Phenomena ,QC ,LIGO Scientific Collaboration ,Physics ,Gravitational wave ,Settore FIS/01 - Fisica Sperimentale ,Astrophysics::Instrumentation and Methods for Astrophysics ,LIGO ,Cosmic string ,[ SDU.ASTR.CO ] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] ,ComputingMethodologies_DOCUMENTANDTEXTPROCESSING ,[PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] ,cosmology ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Cosmic strings can give rise to a large variety of interesting astrophysical phenomena. Among them, powerful bursts of gravitational waves (GWs) produced by cusps are a promising observational signature. In this Letter we present a search for GWs from cosmic string cusps in data collected by the LIGO and Virgo gravitational wave detectors between 2005 and 2010, with over 625 days of live time. We find no evidence of GW signals from cosmic strings. From this result, we derive new constraints on cosmic string parameters, which complement and improve existing limits from previous searches for a stochastic background of GWs from cosmic microwave background measurements and pulsar timing data. In particular, if the size of loops is given by the gravitational backreaction scale, we place upper limits on the string tension Gμ below 10(-8) in some regions of the cosmic string parameter space. ispartof: PHYSICAL REVIEW LETTERS vol:112 issue:13 ispartof: location:United States status: published
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- 2014
50. Optimization of NANOGrav's Time Allocation for Maximum Sensitivity to Single Sources
- Author
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Ryan Anella, Richard Camuccio, Andrea N. Lommen, Lee Samuel Finn, Emma Handzo, and B. Christy
- Subjects
Physics ,Gravitational wave ,Astrophysics::High Energy Astrophysical Phenomena ,Time allocation ,Astrophysics::Instrumentation and Methods for Astrophysics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Ranging ,Astrophysics ,Pulsar ,Space and Planetary Science ,Millisecond pulsar ,Observatory ,Sensitivity (control systems) ,Astrophysics - Instrumentation and Methods for Astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Noise (radio) - Abstract
Pulsar Timing Arrays (PTAs) are a collection of precisely timed millisecond pulsars (MSPs) that can search for gravitational waves (GWs) in the nanohertz frequency range by observing characteristic signatures in the timing residuals. The sensitivity of a PTA depends on the direction of the propagating gravitational wave source, the timing accuracy of the pulsars, and the allocation of the available observing time. The goal of this paper is to determine the optimal time allocation strategy among the MSPs in the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) for a single source of GW under a particular set of assumptions. We consider both an isotropic distribution of sources across the sky and a specific source in the Virgo cluster. This work improves on previous efforts by modeling the effect of intrinsic spin noise for each pulsar. We find that, in general, the array is optimized by maximizing time spent on the best-timed pulsars, with sensitivity improvements typically ranging from a factor of 1.5 to 4., Comment: Accepted by Astrophyiscal Journal
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- 2014
- Full Text
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