5,515 results on '"Boyle, Michael"'
Search Results
2. High-Precision Ringdown Surrogate Model for Non-Precessing Binary Black Holes
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Zertuche, Lorena Magaña, Stein, Leo C., Mitman, Keefe, Field, Scott E., Varma, Vijay, Boyle, Michael, Deppe, Nils, Kidder, Lawrence E., Moxon, Jordan, Pfeiffer, Harald P., Scheel, Mark A., Nelli, Kyle C., Throwe, William, and Vu, Nils L.
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General Relativity and Quantum Cosmology - Abstract
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision than ever before. In this work, we introduce a spin-aligned surrogate ringdown model. This ringdown surrogate, NRSur3dq8_RD, is built with numerical waveforms produced using Cauchy-characteristic evolution. In addition, these waveforms are in the superrest frame of the remnant black hole allowing us to do a correct analysis of the ringdown spectrum. The novel prediction of our surrogate model is complex-valued quasinormal mode (QNM) amplitudes, with median relative errors of $10^{-2}-10^{-3}$ over the parameter space. Like previous remnant surrogates, we also predict the remnant black hole's mass and spin. The QNM mode amplitude errors translate into median errors on ringdown waveforms of $10^{-4}$. The high accuracy and QNM mode content provided by our surrogate will enable high-precision ringdown analyses such as tests of general relativity. Our ringdown model is publicly available through the python package surfinBH., Comment: 11+2 pages, 13 figures, 1 table. This new model is publicly available through surfinBH https://pypi.org/project/surfinBH/
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- 2024
3. Binary neutron star mergers using a discontinuous Galerkin-finite difference hybrid method
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Deppe, Nils, Foucart, Francois, Bonilla, Marceline S., Boyle, Michael, Corso, Nicholas J., Duez, Matthew D., Giesler, Matthew, Hébert, François, Kidder, Lawrence E., Kim, Yoonsoo, Kumar, Prayush, Legred, Isaac, Lovelace, Geoffrey, Most, Elias R., Moxon, Jordan, Nelli, Kyle C., Pfeiffer, Harald P., Scheel, Mark A., Teukolsky, Saul A., Throwe, William, and Vu, Nils L.
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General Relativity and Quantum Cosmology - Abstract
We present a discontinuous Galerkin-finite difference hybrid scheme that allows high-order shock capturing with the discontinuous Galerkin method for general relativistic magnetohydrodynamics in dynamical spacetimes. We present several optimizations and stability improvements to our algorithm that allow the hybrid method to successfully simulate single, rotating, and binary neutron stars. The hybrid method achieves the efficiency of discontinuous Galerkin methods throughout almost the entire spacetime during the inspiral phase, while being able to robustly capture shocks and resolve the stellar surfaces. We also use Cauchy-Characteristic evolution to compute the first gravitational waveforms at future null infinity from binary neutron star mergers. The simulations presented here are the first successful binary neutron star inspiral and merger simulations using discontinuous Galerkin methods., Comment: 31 pages, 8 figures, comments welcome!
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- 2024
4. A Comparative Analysis of Student Performance Predictions in Online Courses using Heterogeneous Knowledge Graphs
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Trask, Thomas, Lytle, Nicholas, Boyle, Michael, Joyner, David, and Mubarak, Ahmed
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Computer Science - Computers and Society ,Computer Science - Artificial Intelligence ,Computer Science - Machine Learning - Abstract
As online courses become the norm in the higher-education landscape, investigations into student performance between students who take online vs on-campus versions of classes become necessary. While attention has been given to looking at differences in learning outcomes through comparisons of students' end performance, less attention has been given in comparing students' engagement patterns between different modalities. In this study, we analyze a heterogeneous knowledge graph consisting of students, course videos, formative assessments and their interactions to predict student performance via a Graph Convolutional Network (GCN). Using students' performance on the assessments, we attempt to determine a useful model for identifying at-risk students. We then compare the models generated between 5 on-campus and 2 fully-online MOOC-style instances of the same course. The model developed achieved a 70-90\% accuracy of predicting whether a student would pass a particular problem set based on content consumed, course instance, and modality., Comment: 6 pages, 3 figures, 2 tables, Educational Data Mining Conference 2024
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- 2024
5. A Review of Gravitational Memory and BMS Frame Fixing in Numerical Relativity
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Mitman, Keefe, Boyle, Michael, Stein, Leo C., Deppe, Nils, Kidder, Lawrence E., Moxon, Jordan, Pfeiffer, Harald P., Scheel, Mark A., Teukolsky, Saul A., Throwe, William, and Vu, Nils L.
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General Relativity and Quantum Cosmology ,High Energy Physics - Theory - Abstract
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simulations. With this, gravitational wave models and our understanding of the fundamental nature of general relativity have been vastly improved. In this paper, we review the history and intuition behind memory effects and BMS symmetries, how they manifest in gravitational waves, and how controlling the infinite number of BMS freedoms of numerical relativity simulations can crucially improve the waveform models that are used by gravitational wave detectors. We reiterate the fact that, with memory effects and BMS symmetries, not only can these next-generation numerical waveforms be used to observe never-before-seen physics, but they can also be used to test GR and learn new astrophysical information about our universe., Comment: 20 pages, 8 figures. Submitted to CGQ's focus issue: Gravitational-Wave Memory Effects: From Theory to Observation
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- 2024
6. Improved frequency spectra of gravitational waves with memory in a binary-black-hole simulation
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Chen, Yitian, Boyle, Michael, Deppe, Nils, Kidder, Lawrence E., Mitman, Keefe, Moxon, Jordan, Nelli, Kyle C., Pfeiffer, Harald P., Scheel, Mark A., Throwe, William, Vu, Nils L., and Teukolsky, Saul A.
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General Relativity and Quantum Cosmology - Abstract
Numerical relativists can now produce gravitational waveforms with memory effects routinely and accurately. The gravitational-wave memory effect contains very low-frequency components, including a persistent offset. The presence of these components violates basic assumptions about time-shift behavior underpinning standard data-analysis techniques in gravitational-wave astronomy. This poses a challenge to the analysis of waveform spectra: How to preserve the low-frequency characteristics when transforming a time-domain waveform to the frequency domain. To tackle this challenge, we revisit the preprocessing procedures applied to the waveforms that contain memory effects. We find inconsistency between the zero-frequency limit of displacement memory and the low- frequency spectrum of the same memory preprocessed using the common scheme in literature. To resolve the inconsistency, we propose a new robust preprocessing scheme that produces the spectra of memory waveforms more faithfully. Using this new scheme, we inspect several characteristics of the spectrum of a memory waveform. In particular, we find a discernible beating pattern formed by the dominant oscillatory mode and the displacement memory. This pattern is absent in the spectrum of a waveform without memory. The difference between the memory and no-memory waveforms is too small to be observed by current-generation detectors in a single binary-black-hole event. Detecting the memory in a single event is likely to occur in the era of next-generation detectors., Comment: 24 pages, 11 figures, 5 tables
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- 2024
7. Optimizing post-Newtonian parameters and fixing the BMS frame for numerical-relativity waveform hybridizations
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Sun, Dongze, Boyle, Michael, Mitman, Keefe, Scheel, Mark A., Stein, Leo C., Teukolsky, Saul A., and Varma, Vijay
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General Relativity and Quantum Cosmology - Abstract
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce waveforms with enough orbits to cover the whole frequency band of gravitational-wave observatories. Accordingly, it is important to be able to hybridize NR waveforms with analytic, post-Newtonian (PN) waveforms, which are accurate during the early inspiral phase. We show that to build such hybrids, it is crucial to both fix the Bondi-Metzner-Sachs (BMS) frame of the NR waveforms to match that of PN theory, and optimize over the PN parameters. We test such a hybridization procedure including all spin-weighted spherical harmonic modes with $|m|\leq \ell$ for $\ell\leq 8$, using 29 NR waveforms with mass ratios $q\leq 10$ and spin magnitudes $|\chi_1|, |\chi_2|\leq 0.8$. We find that for spin-aligned systems, the PN and NR waveforms agree very well. The difference is limited by the small nonzero orbital eccentricity of the NR waveforms, or equivalently by the lack of eccentric terms in the PN waveforms. To maintain full accuracy of the simulations, the matching window for spin-aligned systems should be at least 5 orbits long and end at least 15 orbits before merger. For precessing systems, the errors are larger than for spin-aligned cases. The errors are likely limited by the absence of precession-related spin-spin PN terms. Using $10^5\,M$ long NR waveforms, we find that there is no optimal choice of the matching window within this time span, because the hybridization result for precessing cases is always better if using earlier or longer matching windows. We provide the mean orbital frequency of the smallest acceptable matching window as a function of the target error between the PN and NR waveforms and the black hole spins., Comment: 21 pages, 22 figures
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- 2024
8. Striking the right tone: toward a self-consistent framework for measuring black hole ringdowns
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Clarke, Teagan A., Isi, Maximiliano, Lasky, Paul D., Thrane, Eric, Boyle, Michael, Deppe, Nils, Kidder, Lawrence E., Mitman, Keefe, Moxon, Jordan, Nelli, Kyle C., Throwe, William, and Vu, Nils L.
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General Relativity and Quantum Cosmology ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
The ringdown portion of a binary black hole merger consists of a sum of modes, each containing an infinite number of tones that are exponentially damped sinusoids. In principle, these can be measured as gravitational-waves with observatories like LIGO/Virgo/KAGRA, however in practice it is unclear how many tones can be meaningfully resolved. We investigate the consistency and resolvability of the overtones of the quadrupolar $\ell = m = 2$ mode by starting at late times when the gravitational waveform is expected to be well-approximated by the $\ell m n = 220$ tone alone. We present a Bayesian inference framework to measure the tones in numerical relativity data. We measure tones at different start times, checking for consistency: we classify a tone as stably recovered if and only if the 95\% credible intervals for amplitude and phase at time $t$ overlap with the credible intervals at all subsequent times. We test a set of tones including the first four overtones of the fundamental mode and the 320 tone and find that the 220 and 221 tones can be measured consistently with the inclusion of additional overtones. The 222 tone measurements can be stabilised when we include the 223 tone, but only in a narrow time window, after which it is too weak to measure. The 223 tone recovery appears to be unstable, and does not become stable with the introduction of the 224 tone. We find that $N=3$ tones can be stably recovered simultaneously. However, when analysing $N \geq 4$ tones, the amplitude of one tone is consistent with zero. Thus, within our framework, one can identify only $N=3$ tones with non-zero amplitude that are simultaneously stable., Comment: 14 pages, 8 figures, 2 tables. Published in PRD
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- 2024
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9. Boyle, Michael J.: THE DRONE AGE
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The Drone Age (Nonfiction work) -- Boyle, Michael J. ,Business ,Library and information science ,Publishing industry - Abstract
Boyle, Michael J. THE DRONE AGE Oxford Univ. (NonFiction None) $29.95 6, 1 ISBN: 978-0-19-063586-2 Drones have become nearly ubiquitous over the last two decades. Here’s a detailed look at [...]
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- 2020
10. Boyle Michael J. Non-Western Responses to Terrorism
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Sinai, Joshua
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- 2019
11. Nonlinear Effects In Black Hole Ringdown From Scattering Experiments I: spin and initial data dependence of quadratic mode coupling
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Zhu, Hengrui, Ripley, Justin L., Pretorius, Frans, Ma, Sizheng, Mitman, Keefe, Owen, Robert, Boyle, Michael, Chen, Yitian, Deppe, Nils, Kidder, Lawrence E., Moxon, Jordan, Nelli, Kyle C., Pfeiffer, Harald P., Scheel, Mark A., Throwe, William, and Vu, Nils L.
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General Relativity and Quantum Cosmology ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We investigate quadratic quasinormal mode coupling in black hole spacetime through numerical simulations of single perturbed black holes using both numerical relativity and second-order black hole perturbation theory. Focusing on the dominant $\ell=|m|=2$ quadrupolar modes, we find good agreement (within $\sim10\%$) between these approaches, with discrepancies attributed to truncation error and uncertainties from mode fitting. Our results align with earlier studies extracting the coupling coefficients from select binary black hole merger simulations, showing consistency for the same remnant spins. Notably, the coupling coefficient is insensitive to a diverse range of initial data, including configurations that led to a significant (up to $5\%$) increase in the remnant black hole mass. These findings present opportunities for testing the nonlinear dynamics of general relativity with ground-based gravitational wave observatories. Lastly, we provide evidence of a bifurcation in coupling coefficients between counter-rotating and co-rotating quasinormal modes as black hole spin increases.
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- 2024
12. Black Hole Spectroscopy for Precessing Binary Black Hole Coalescences
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Zhu, Hengrui, Siegel, Harrison, Mitman, Keefe, Isi, Maximiliano, Farr, Will M., Boyle, Michael, Deppe, Nils, Kidder, Lawrence E., Ma, Sizheng, Moxon, Jordan, Nelli, Kyle C., Pfeiffer, Harald P., Scheel, Mark A., Teukolsky, Saul A., Throwe, William, Varma, Vijay, and Vu, Nils L.
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General Relativity and Quantum Cosmology ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
The spectroscopic study of black hole quasinormal modes in gravitational-wave ringdown observations is hindered by our ignorance of which modes should dominate astrophysical signals for different binary configurations, limiting tests of general relativity and astrophysics. In this work, we present a description of the quasinormal modes that are excited in the ringdowns of comparable mass, quasi-circular precessing binary black hole coalescences -- a key region of parameter space that has yet to be fully explored within the framework of black hole spectroscopy. We suggest that the remnant perturbation for precessing and non-precessing systems is approximately the same up to a rotation, which implies that the relative amplitudes of the quasinormal modes in both systems are also related by a rotation. We present evidence for this by analyzing an extensive catalog of numerical relativity simulations. Additional structure in the amplitudes is connected to the system's kick velocity and other asymmetries in the orbital dynamics. We find that the ringdowns of precessing systems need not be dominated by the ${(\ell,m)=(2,\pm 2)}$ quasinormal modes, and that instead the $(2,\pm 1)$~or~$(2,0)$ quasinormal modes can dominate. Our results are consistent with a ringdown analysis of the LIGO-Virgo gravitational wave signal GW190521, and may also help in understanding phenomenological inspiral-merger-ringdown waveform model systematics., Comment: Data Release and Analysis Scripts: https://github.com/HengruiPrinceton/precession_ringdown
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- 2023
13. Hunter’s multifaceted Boyle: Michael Hunter: Boyle studies: Aspects of the life and thought of Robert Boyle (1627–1691). Farnham, Surrey: Ashgate, 2015, xiv + 244pp, $124.95 HB
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MacIntosh, J. J.
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- 2017
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14. Thresholds for adding degraded tropical forest to the conservation estate
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Ewers, Robert M., Orme, C. David L., Pearse, William D., Zulkifli, Nursyamin, Yvon-Durocher, Genevieve, Yusah, Kalsum M., Yoh, Natalie, Yeo, Darren C. J., Wong, Anna, Williamson, Joseph, Wilkinson, Clare L., Wiederkehr, Fabienne, Webber, Bruce L., Wearn, Oliver R., Wai, Leona, Vollans, Maisie, Twining, Joshua P., Turner, Edgar C., Tobias, Joseph A., Thorley, Jack, Telford, Elizabeth M., Teh, Yit Arn, Tan, Heok Hui, Swinfield, Tom, Svátek, Martin, Struebig, Matthew, Stork, Nigel, Sleutel, Jani, Slade, Eleanor M., Sharp, Adam, Shabrani, Adi, Sethi, Sarab S., Seaman, Dave J. I., Sawang, Anati, Roxby, Gabrielle Briana, Rowcliffe, J. Marcus, Rossiter, Stephen J., Riutta, Terhi, Rahman, Homathevi, Qie, Lan, Psomas, Elizabeth, Prairie, Aaron, Poznansky, Frederica, Pillay, Rajeev, Picinali, Lorenzo, Pianzin, Annabel, Pfeifer, Marion, Parrett, Jonathan M., Noble, Ciar D., Nilus, Reuben, Mustaffa, Nazirah, Mullin, Katherine E., Mitchell, Simon, Mckinlay, Amelia R., Maunsell, Sarah, Matula, Radim, Massam, Michael, Martin, Stephanie, Malhi, Yadvinder, Majalap, Noreen, Maclean, Catherine S., Mackintosh, Emma, Luke, Sarah H., Lewis, Owen T., Layfield, Harry J., Lane-Shaw, Isolde, Kueh, Boon Hee, Kratina, Pavel, Konopik, Oliver, Kitching, Roger, Kinneen, Lois, Kemp, Victoria A., Jotan, Palasiah, Jones, Nick, Jebrail, Evyen W., Hroneš, Michal, Heon, Sui Peng, Hemprich-Bennett, David R., Haysom, Jessica K., Harianja, Martina F., Hardwick, Jane, Gregory, Nichar, Gray, Ryan, Gray, Ross E. J., Granville, Natasha, Gill, Richard, Fraser, Adam, Foster, William A., Folkard-Tapp, Hollie, Fletcher, Robert J., Fikri, Arman Hadi, Fayle, Tom M., Faruk, Aisyah, Eggleton, Paul, Edwards, David P., Drinkwater, Rosie, Dow, Rory A., Döbert, Timm F., Didham, Raphael K., Dickinson, Katharine J. M., Deere, Nicolas J., de Lorm, Tijmen, Dawood, Mahadimenakbar M., Davison, Charles W., Davies, Zoe G., Davies, Richard G., Dančák, Martin, Cusack, Jeremy, Clare, Elizabeth L., Chung, Arthur, Chey, Vun Khen, Chapman, Philip M., Cator, Lauren, Carpenter, Daniel, Carbone, Chris, Calloway, Kerry, Bush, Emma R., Burslem, David F. R. P., Brown, Keiron D., Brooks, Stephen J., Brasington, Ella, Brant, Hayley, Boyle, Michael J. W., Both, Sabine, Blackman, Joshua, Bishop, Tom R., Bicknell, Jake E., Bernard, Henry, Basrur, Saloni, Barclay, Maxwell V. L., Barclay, Holly, Atton, Georgina, Ancrenaz, Marc, Aldridge, David C., Daniel, Olivia Z., Reynolds, Glen, and Banks-Leite, Cristina
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- 2024
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15. Extending black-hole remnant surrogate models to extreme mass ratios
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Boschini, Matteo, Gerosa, Davide, Varma, Vijay, Armaza, Cristobal, Boyle, Michael, Bonilla, Marceline S., Ceja, Andrea, Chen, Yitian, Deppe, Nils, Giesler, Matthew, Kidder, Lawrence E., Kumar, Prayush, Lara, Guillermo, Long, Oliver, Ma, Sizheng, Mitman, Keefe, Nee, Peter James, Pfeiffer, Harald P., Ramos-Buades, Antoni, Scheel, Mark A., Vu, Nils L., and Yoo, Jooheon
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General Relativity and Quantum Cosmology ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
Numerical-relativity surrogate models for both black-hole merger waveforms and remnants have emerged as important tools in gravitational-wave astronomy. While producing very accurate predictions, their applicability is limited to the region of the parameter space where numerical-relativity simulations are available and computationally feasible. Notably, this excludes extreme mass ratios. We present a machine-learning approach to extend the validity of existing and future numerical-relativity surrogate models toward the test-particle limit, targeting in particular the mass and spin of post-merger black-hole remnants. Our model is trained on both numerical-relativity simulations at comparable masses and analytical predictions at extreme mass ratios. We extend the gaussian-process-regression model NRSur7dq4Remnant, validate its performance via cross validation, and test its accuracy against additional numerical-relativity runs. Our fit, which we dub NRSur7dq4EmriRemnant, reaches an accuracy that is comparable to or higher than that of existing remnant models while providing robust predictions for arbitrary mass ratios., Comment: 10 pages, 3 figures. Published in PRD. Model publicly available at https://pypi.org/project/surfinBH
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- 2023
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16. Numerical relativity surrogate model with memory effects and post-Newtonian hybridization
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Yoo, Jooheon, Mitman, Keefe, Varma, Vijay, Boyle, Michael, Field, Scott E., Deppe, Nils, Hébert, François, Kidder, Lawrence E., Moxon, Jordan, Pfeiffer, Harald P., Scheel, Mark A., Stein, Leo C., Teukolsky, Saul A., Throwe, William, and Vu, Nils L.
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General Relativity and Quantum Cosmology - Abstract
Numerical relativity simulations provide the most precise templates for the gravitational waves produced by binary black hole mergers. However, many of these simulations use an incomplete waveform extraction technique -- extrapolation -- that fails to capture important physics, such as gravitational memory effects. Cauchy-characteristic evolution (CCE), by contrast, is a much more physically accurate extraction procedure that fully evolves Einstein's equations to future null infinity and accurately captures the expected physics. In this work, we present a new surrogate model, NRHybSur3dq8$\_$CCE, built from CCE waveforms that have been mapped to the post-Newtonian (PN) BMS frame and then hybridized with PN and effective one-body (EOB) waveforms. This model is trained on 102 waveforms with mass ratios $q\leq8$ and aligned spins $\chi_{1z}, \, \chi_{2z} \in \left[-0.8, 0.8\right]$. The model spans the entire LIGO-Virgo-KAGRA (LVK) frequency band (with $f_{\text{low}}=20\text{Hz}$) for total masses $M\gtrsim2.25M_{\odot}$ and includes the $\ell\leq4$ and $(\ell,m)=(5,5)$ spin-weight $-2$ spherical harmonic modes, but not the $(3,1)$, $(4,2)$ or $(4,1)$ modes. We find that NRHybSur3dq8$\_$CCE can accurately reproduce the training waveforms with mismatches $\lesssim2\times10^{-4}$ for total masses $2.25M_{\odot}\leq M\leq300M_{\odot}$ and can, for a modest degree of extrapolation, capably model outside of its training region. Most importantly, unlike previous waveform models, the new surrogate model successfully captures memory effects., Comment: 14 pages, 11 figures. Accepted for publication in PRD
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- 2023
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17. Interferon-epsilon is a novel regulator of NK cell responses in the uterus
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Mayall, Jemma R, Horvat, Jay C, Mangan, Niamh E, Chevalier, Anne, McCarthy, Huw, Hampsey, Daniel, Donovan, Chantal, Brown, Alexandra C, Matthews, Antony Y, de Weerd, Nicole A, de Geus, Eveline D, Starkey, Malcolm R, Kim, Richard Y, Daly, Katie, Goggins, Bridie J, Keely, Simon, Maltby, Steven, Baldwin, Rennay, Foster, Paul S, Boyle, Michael J, Tanwar, Pradeep S, Huntington, Nicholas D, Hertzog, Paul J, and Hansbro, Philip M
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- 2024
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18. Laying the foundation of the effective-one-body waveform models SEOBNRv5: improved accuracy and efficiency for spinning non-precessing binary black holes
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Pompili, Lorenzo, Buonanno, Alessandra, Estellés, Héctor, Khalil, Mohammed, van de Meent, Maarten, Mihaylov, Deyan P., Ossokine, Serguei, Pürrer, Michael, Ramos-Buades, Antoni, Mehta, Ajit Kumar, Cotesta, Roberto, Marsat, Sylvain, Boyle, Michael, Kidder, Lawrence E., Pfeiffer, Harald P., Scheel, Mark A., Rüter, Hannes R., Vu, Nils, Dudi, Reetika, Ma, Sizheng, Mitman, Keefe, Melchor, Denyz, Thomas, Sierra, and Sanchez, Jennifer
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General Relativity and Quantum Cosmology - Abstract
We present SEOBNRv5HM, a more accurate and faster inspiral-merger-ringdown gravitational waveform model for quasi-circular, spinning, nonprecessing binary black holes within the effective-one-body (EOB) formalism. Compared to its predecessor, SEOBNRv4HM, the waveform model i) incorporates recent high-order post- Newtonian results in the inspiral, with improved resummations, ii) includes the gravitational modes (l, |m|) = (3, 2), (4, 3), in addition to the (2, 2), (3, 3), (2, 1), (4, 4), (5, 5) modes already implemented in SEOBNRv4HM, iii) is calibrated to larger mass-ratios and spins using a catalog of 442 numerical-relativity (NR) simulations and 13 additional waveforms from black-hole perturbation theory, iv) incorporates information from second-order gravitational self-force (2GSF) in the nonspinning modes and radiation-reaction force. Computing the unfaithfulness against NR simulations, we find that for the dominant (2, 2) mode the maximum unfaithfulness in the total mass range $10-300 M_{\odot}$ is below $10^{-3}$ for 90% of the cases (38% for SEOBNRv4HM). When including all modes up to l = 5 we find 98% (49%) of the cases with unfaithfulness below $10^{-2} (10^{-3})$, while these numbers reduce to 88% (5%) when using SEOBNRv4HM. Furthermore, the model shows improved agreement with NR in other dynamical quantities (e.g., the angular momentum flux and binding energy), providing a powerful check of its physical robustness. We implemented the waveform model in a high-performance Python package (pySEOBNR), which leads to evaluation times faster than SEOBNRv4HM by a factor 10 to 50, depending on the configuration, and provides the flexibility to easily include spin-precession and eccentric effects, thus making it the starting point for a new generation of EOBNR waveform models (SEOBNRv5) to be employed for upcoming observing runs of the LIGO-Virgo-KAGRA detectors.
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- 2023
19. Bankruptcy Orders BOYLE, MICHAEL ,No 38 of 2020
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Bankruptcy ,Demolition ,Email ,Company financing ,Company bankruptcy ,General interest ,News, opinion and commentary - Abstract
London: The Gazette (official Public Record office) of United Kingdom has issued the following notice: Bankruptcy Orders BOYLE, MICHAEL 15 St. Johns, SUNDERLAND, SR1 2DH MICHAEL BOYLE CURRENTLY PROVIDER OF [...]
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- 2020
20. The Choice for Terrorism : Possession and Milieu Goals Among Terrorist Groups
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Boyle, Michael J.
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- 2023
21. Eccentric binary black holes: Comparing numerical relativity and small mass-ratio perturbation theory
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Ramos-Buades, Antoni, van de Meent, Maarten, Pfeiffer, Harald P., Rüter, Hannes R., Scheel, Mark A., Boyle, Michael, and Kidder, Lawrence E.
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General Relativity and Quantum Cosmology ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
The modelling of unequal mass binary black hole systems is of high importance to detect and estimate parameters from these systems. Numerical relativity (NR) is well suited to study systems with comparable component masses, $m_1\sim m_2$, whereas small mass ratio (SMR) perturbation theory applies to binaries where $q=m_2/m_1<< 1$. This work investigates the applicability for NR and SMR as a function of mass ratio for eccentric non-spinning binary black holes. We produce $52$ NR simulations with mass ratios between $1:10$ and $1:1$ and initial eccentricities up to $0.7$. From these we extract quantities like gravitational wave energy and angular momentum fluxes and periastron advance, and assess their accuracy. To facilitate comparison, we develop tools to map between NR and SMR inspiral evolutions of eccentric binary black holes. We derive post-Newtonian accurate relations between different definitions of eccentricity. Based on these analyses, we introduce a new definition of eccentricity based on the (2,2)-mode of the gravitational radiation, which reduces to the Newtonian definition of eccentricity in the Newtonian limit. From the comparison between NR simulations and SMR results, we quantify the unknown next-to-leading order SMR contributions to the gravitational energy and angular momentum fluxes, and periastron advance. We show that in the comparable mass regime these contributions are subdominant and higher order SMR contributions are negligible.
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- 2022
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22. Fixing the BMS frame of numerical relativity waveforms with BMS charges
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Mitman, Keefe, Stein, Leo C., Boyle, Michael, Deppe, Nils, Hébert, François, Kidder, Lawrence E., Moxon, Jordan, Scheel, Mark A., Teukolsky, Saul A., Throwe, William, and Vu, Nils L.
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General Relativity and Quantum Cosmology ,High Energy Physics - Theory - Abstract
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves that propagate there, has become increasingly important for accurate modeling of waveforms. In particular, waveform models, such as post-Newtonian (PN) expressions, numerical relativity (NR), and black hole perturbation theory, produce results that are in different BMS frames. Consequently, to build a model for the waveforms produced during the merging of compact objects, which ideally would be a hybridization of PN, NR, and black hole perturbation theory, one needs a fast and robust method for fixing the BMS freedoms. In this work, we present the first means of fixing the entire BMS freedom of NR waveforms to match the frame of either PN waveforms or black hole perturbation theory. We achieve this by finding the BMS transformations that change certain charges in a prescribed way -- e.g., finding the center-of-mass transformation that maps the center-of-mass charge to a mean of zero. We find that this new method is 20 times faster, and more correct when mapping to the superrest frame, than previous methods that relied on optimization algorithms. Furthermore, in the course of developing this charge-based frame fixing method, we compute the PN expression for the Moreschi supermomentum to 3PN order without spins and 2PN order with spins. This Moreschi supermomentum is effectively equivalent to the energy flux or the null memory contribution at future null infinity $\mathscr{I}^{+}$. From this PN calculation, we also compute oscillatory ($m\not=0$ modes) and spin-dependent memory terms that have not been identified previously or have been missing from strain expressions in the post-Newtonian literature., Comment: 16+4 pages with 2 appendices, 4 figures, 1 table
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- 2022
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23. Multipole moments on the common horizon in a binary-black-hole simulation
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Chen, Yitian, Kumar, Prayush, Khera, Neev, Deppe, Nils, Dhani, Arnab, Boyle, Michael, Giesler, Matthew, Kidder, Lawrence E., Pfeiffer, Harald P., Scheel, Mark A., and Teukolsky, Saul A.
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General Relativity and Quantum Cosmology - Abstract
We construct the covariantly defined multipole moments on the common horizon of an equal-mass, non-spinning, quasicircular binary-black-hole system. We see a strong correlation between these multipole moments and the gravitational waveform. We find that the multipole moments are well described by the fundamental quasinormal modes at sufficiently late times. For each multipole moment, at least two fundamental modes of different $\ell$ are detectable in the best model. These models provide faithful estimates of the true mass and spin of the remnant black hole. We also show that by including overtones, the $\ell=m=2$ mass multipole moment admits an excellent quasinormal-mode description at all times after the merger. This demonstrates the perhaps surprising power of perturbation theory near the merger., Comment: 23 pages, 17 figures, 2 tables
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- 2022
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24. Targeted large mass ratio numerical relativity surrogate waveform model for GW190814
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Yoo, Jooheon, Varma, Vijay, Giesler, Matthew, Scheel, Mark A., Haster, Carl-Johan, Pfeiffer, Harald P., Kidder, Lawrence E., and Boyle, Michael
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General Relativity and Quantum Cosmology ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
Gravitational wave observations of large mass ratio compact binary mergers like GW190814 highlight the need for reliable, high-accuracy waveform templates for such systems. We present NRHybSur2dq15, a new surrogate model trained on hybridized numerical relativity (NR) waveforms with mass ratios $q\leq15$, and aligned spins $|\chi_{1z}|\leq0.5$ and $\chi_{2z}=0$. We target the parameter space of GW190814-like events as large mass ratio NR simulations are very expensive. The model includes the (2,2), (2,1), (3,3), (4,4), and (5,5) spin-weighted spherical harmonic modes, and spans the entire LIGO bandwidth (with $f_{\mathrm{low}}=20$ Hz) for total masses $M \gtrsim 9.5 \, M_{\odot}$. NRHybSur2dq15 accurately reproduces the hybrid waveforms, with mismatches below $\sim 2 \times 10^{-3}$ for total masses $10 \, M_{\odot} \leq M \leq 300 \, M_{\odot}$. This is at least an order of magnitude improvement over existing semi-analytical models for GW190814-like systems. Finally, we reanalyze GW190814 with the new model and obtain source parameter constraints consistent with previous work., Comment: 14 pages, 9 figures; Accepted for publication in PRD
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- 2022
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25. Human Rights Approaches to Environmental Protection Alan Boyle Michael Anderson
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Fitzmaurice, Malgosia
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- 1998
26. Human Rights Approaches to Environmental Protection. Alan E. Boyle Michael R. Anderson
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Bilder, Richard B. and Roht-Arriaza, Naomi
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- 1997
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27. Q2 2024 Bain Capital Specialty Finance Inc Earnings Call - Final
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Business - Abstract
Presentation OPERATOR: Good day, everyone, and welcome to today's Bain Capital Specialty Finance second-quarter ended -- June 30, 2024 earnings conference call. (Operator Instructions) It is now my pleasure to [...]
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- 2024
28. Stuttering, Intersectionality, and Identity: A Qualitative Analysis of the Experiences of Lesbian, Gay, and Bisexual Individuals Who Stutter
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Daniels, Derek E., Boyle, Michael P., and Archer, Brent E.
- Abstract
Purpose: Speech-language pathologists are influential in shaping identity development for individuals who stutter, particularly as it relates to communication. This study investigated the experiences of lesbian, gay, and bisexual individuals who stutter to learn more about how multiple marginalized identities affect their psychosocial experiences. Method: Semi-structured interviews were conducted with seven individuals who stutter with lesbian, gay, and bisexual identities. Participants ranged in age from 22 to 60 years. Data were analyzed for themes and categories by using interpretive phenomenological analysis. Results: Four primary themes were identified: (a) the importance of visibility and shared social identity connections for affirmation; (b) effects of oppressive social expectations on identity; (c) intersectionality of stuttering, gay, lesbian, and bisexual identities; and (d) effects of not being affirmed for identity. Discussion: Results are discussed in the context of identity affirmation and intersectionality. Through an understanding of identity formation and psychosocial experiences of lesbian, gay, and bisexual individuals who stutter, speech-language pathologists can use identity-affirmative practices to support individuals who stutter and mitigate stigmatizing experiences. Implications focus on suggestions for the provision of identity-affirming speech-language pathology practices for students who stutter.
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- 2023
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29. Witness to Hope: Catholic Schools Respond to COVID-19
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Boyle, Michael, Donahue, Gail, Donoghue, Mary Pat, Faber, David A., Jones, Frankie, Ray-Timoney, Jeannie, Tesche, Brooke, and Uhl, Timothy D.
- Abstract
The twin uncertainties of the pandemic and the economic downturn have taken a toll on our Catholic schools. Yet reports across the country are that Catholic schools have been very successful in remote learning. Although there are well-documented efforts to define the values of Catholic schools, these values are not fully known and there is still not a well-crafted national value proposition for Catholic schools. As the context surrounding Catholic schools has changed, it has become imperative that Catholic schools coalesce around a new value proposition during uncertain times. What follows is an attempt by a group of dedicated Catholic school stakeholders determined to change the narrative. As our schools have pivoted to new forms of delivery and connections, this ad hoc group represents the same type of creative efforts to form a community. As a committee, we identified five themes of hope that can continue to guide the work and witness of our Catholic schools: prayer, partnership with families, personalization, persistence, and planning. In the following sections, we provide a rationale and overview of each theme. We also include relevant testimonials of diverse stakeholders to illuminate each theme and give voice to the hope across our school communities.
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- 2020
30. To Act with Justice and Love Tenderly: Exploring the Church's Call for Inclusion
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Boyle, Michael J.
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This paper explores some of the documents that provide a foundation for the Church and its ministries to deliver justice and mercy to all, including students with disabilities. First, Catholic Social Teaching (CST) traditions will be presented as the foundation to some of the documents of the American Church. A chronology of the documents of United States bishops will trace the flow of CST as the impetus for designing and delivering programs for students with disabilities in Catholic schools. Implications for Catholic schools are outlined for next steps for implementation. [Note: The page range (5-22) shown via the .pdf is incorrect. The correct page range is 5-23.]
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- 2020
31. High Precision Ringdown Modeling: Multimode Fits and BMS Frames
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Zertuche, Lorena Magaña, Mitman, Keefe, Khera, Neev, Stein, Leo C., Boyle, Michael, Deppe, Nils, Hébert, François, Iozzo, Dante A. B., Kidder, Lawrence E., Moxon, Jordan, Pfeiffer, Harald P., Scheel, Mark A., Teukolsky, Saul A., Throwe, William, and Vu, Nils
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General Relativity and Quantum Cosmology ,Astrophysics - High Energy Astrophysical Phenomena ,High Energy Physics - Theory - Abstract
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing GR. Only recently have QNM studies begun to focus on multimode fitting to numerical relativity (NR) strain waveforms. As GW observatories become even more sensitive they will be able to resolve higher-order modes. Consequently, multimode QNM fits will be critically important, and in turn require a more thorough treatment of the asymptotic frame at $\mathscr{I}^+$. The first main result of this work is a method for systematically fitting a QNM model containing many modes to a numerical waveform produced using Cauchy-characteristic extraction (CCE), an extraction technique which is known to resolve memory effects. We choose the modes to model based on their power contribution to the residual between numerical and model waveforms. We show that the all-mode strain mismatch improves by a factor of $\sim10^5$ when using multimode fitting as opposed to only fitting the $(2,\pm2,n)$ modes. Our most significant result addresses a critical point that has been overlooked in the QNM literature: the importance of matching the Bondi-van der Burg-Metzner-Sachs (BMS) frame of the numerical waveform to that of the QNM model. We show that by mapping the numerical waveforms$-$which exhibit the memory effect$-$to a BMS frame known as the super rest frame, there is an improvement of $\sim10^5$ in the all-mode strain mismatch compared to using a strain waveform whose BMS frame is not fixed. Furthermore, we find that by mapping CCE waveforms to the super rest frame, we can obtain all-mode mismatches that are, on average, a factor of $\sim4$ better than using the publicly-available extrapolated waveforms. We illustrate the effectiveness of these modeling enhancements by applying them to families of waveforms produced by NR and comparing our results to previous QNM studies., Comment: 17 + 2 pages, 11 figures, 2 tables
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- 2021
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32. Simulating magnetized neutron stars with discontinuous Galerkin methods
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Deppe, Nils, Hébert, François, Kidder, Lawrence E., Throwe, William, Anantpurkar, Isha, Armaza, Cristóbal, Bonilla, Gabriel S., Boyle, Michael, Chaudhary, Himanshu, Duez, Matthew D., Vu, Nils L., Foucart, Francois, Giesler, Matthew, Guo, Jason S., Kim, Yoonsoo, Kumar, Prayush, Legred, Isaac, Li, Dongjun, Lovelace, Geoffrey, Ma, Sizheng, Macedo, Alexandra, Melchor, Denyz, Morales, Marlo, Moxon, Jordan, Nelli, Kyle C., O'Shea, Eamonn, Pfeiffer, Harald P., Ramirez, Teresita, Rüter, Hannes R., Sanchez, Jennifer, Scheel, Mark A., Thomas, Sierra, Vieira, Daniel, Wittek, Nikolas A., Wlodarczyk, Tom, and Teukolsky, Saul A.
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General Relativity and Quantum Cosmology ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
Discontinuous Galerkin methods are popular because they can achieve high order where the solution is smooth, because they can capture shocks while needing only nearest-neighbor communication, and because they are relatively easy to formulate on complex meshes. We perform a detailed comparison of various limiting strategies presented in the literature applied to the equations of general relativistic magnetohydrodynamics. We compare the standard minmod/$\Lambda\Pi^N$ limiter, the hierarchical limiter of Krivodonova, the simple WENO limiter, the HWENO limiter, and a discontinuous Galerkin-finite-difference hybrid method. The ultimate goal is to understand what limiting strategies are able to robustly simulate magnetized TOV stars without any fine-tuning of parameters. Among the limiters explored here, the only limiting strategy we can endorse is a discontinuous Galerkin-finite-difference hybrid method., Comment: matches published version. 21 pages, 12 figures. Added KH instability, TOV runs with classical limiters. arXiv admin note: text overlap with arXiv:2109.11645
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- 2021
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33. Major discrimination due to stuttering and its association with quality of life
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Boyle, Michael P. and Cheyne, Madeline R.
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- 2024
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34. Principles of Inferential Statistics
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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35. Descriptive Statistics
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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36. Bivariate and Multivariate Statistics
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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37. Basic Principles of Research and a Guide to Using This Book
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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38. Studying People Quantitatively
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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39. Analyzing Texts and Other Artifacts
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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40. Concept Explication and Measurement
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Boyle, Michael P., primary and Schmierbach, Mike, additional
- Published
- 2023
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41. Ethical Research
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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42. Scholarly Research and the Creation of Knowledge
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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43. Sampling
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Boyle, Michael P., primary and Schmierbach, Mike, additional
- Published
- 2023
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44. Effective Measurement
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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45. Validity
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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46. Basic Concepts of Research
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Boyle, Michael P., primary and Schmierbach, Mike, additional
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- 2023
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47. Reliability and Subjectivity
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Boyle, Michael P., primary and Schmierbach, Mike, additional
- Published
- 2023
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48. Fixing the BMS Frame of Numerical Relativity Waveforms
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Mitman, Keefe, Khera, Neev, Iozzo, Dante A. B., Stein, Leo C., Boyle, Michael, Deppe, Nils, Kidder, Lawrence E., Moxon, Jordan, Pfeiffer, Harald P., Scheel, Mark A., Teukolsky, Saul A., and Throwe, William
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General Relativity and Quantum Cosmology - Abstract
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on such waveforms are performed properly. It is also important that models are built from waveforms in the same BMS frame. Up until now, however, the BMS frame of numerical waveforms has not been thoroughly examined, largely because the necessary tools have not existed. In this paper, we show how to analyze and map to a suitable BMS frame for numerical waveforms calculated with the Spectral Einstein Code (SpEC). However, the methods and tools that we present are general and can be applied to any numerical waveforms. We present an extensive study of 13 binary black hole systems that broadly span parameter space. From these simulations, we extract the strain and also the Weyl scalars using both SpECTRE's Cauchy-characteristic extraction module and also the standard extrapolation procedure with a displacement memory correction applied during postprocessing. First, we show that the current center-of-mass correction used to map these waveforms to the center-of-mass frame is not as effective as previously thought. Consequently, we also develop an improved correction that utilizes asymptotic Poincar\'e charges instead of a Newtonian center-of-mass trajectory. Next, we map our waveforms to the post-Newtonian (PN) BMS frame using a PN strain waveform. This helps us find the unique BMS transformation that minimizes the $L^{2}$ norm of the difference between the numerical and PN strain waveforms during the early inspiral phase. We find that once the waveforms are mapped to the PN BMS frame, they can be hybridized with a PN strain waveform much more effectively than if one used any of the previous alignment schemes, which only utilize the Poincar\'e transformations., Comment: 18 pages, 11 figures; Published in Physical Review D
- Published
- 2021
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49. HUNTING ROBERT BOYLE: MICHAEL HUNTER AND BOYLE'S LIFE AND LETTERS
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Roos, Anna Marie
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- 2011
50. Comparing Remnant Properties from Horizon Data and Asymptotic Data in Numerical Relativity
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Iozzo, Dante A. B., Khera, Neev, Stein, Leo C., Mitman, Keefe, Boyle, Michael, Deppe, Nils, Hebert, Francois, Kidder, Lawrence E., Moxon, Jordan, Pfeiffer, Harald P., Scheel, Mark A., Teukolsky, Saul A., and Throwe, William
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General Relativity and Quantum Cosmology - Abstract
We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass, spin, and recoil velocity of each remnant were determined quasi-locally from apparent horizon data and asymptotically from Bondi data $(h, \psi_4, \psi_3, \psi_2, \psi_1)$ computed at future null infinity using SpECTRE's Cauchy characteristic evolution. We compare these independent measurements of the remnant properties in the bulk and on the boundary of the spacetime, giving insight into how well asymptotic data are able to reproduce local properties of the remnant black hole in numerical relativity. We also discuss the theoretical framework for connecting horizon quantities to asymptotic quantities and how it relates to our results. This study recommends a simple improvement to the recoil velocities reported in the Simulating eXtreme Spacetimes waveform catalog, provides an improvement to future surrogate remnant models, and offers new analysis techniques for evaluating the physical accuracy of numerical simulations., Comment: 14 pages, 4 figures, 1 table; published Physical Review D
- Published
- 2021
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