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2. LISA Pathfinder

Author

Armano, Michele, Audley, Heather, Baird, Jonathon, Binetruy, Pierre, Born, Michael, Bortoluzzi, Daniele, Castelli, Eleanora, Cavalleri, Antonella, Cesarini, Andrea, Cruise, Mike, Danzmann, Karsten, Silva, Marcus de Deus, Diepholz, Ingo, Dixon, George, Dolesi, Rita, Ferraioli, Luigi, Ferroni, Valerio, Fitzsimons, Ewan, Freschi, Mario, Gesa, Luis, Gibert, Ferran, Giardini, Domenico, Giusteri, Roberta, Grimani, Catia, Grzymisch, Jonathan, Harrison, Ian, Heinzel, Gerhard, Hewitson, Martin, Hollington, Daniel, Hoyland, David, Hueller, Mauro, Inchauspe, Henri, Jennrich, Oliver, Jetzer, Philippe, Karnesis, Nikolaos, Kaune, Brigitte, Korsakova, Natalia, Killow, Christian J, Lobo, Alberto, Lloro, Ivan, Liu, Li, Lopez-Zaragoza, Juan-Pedro, Maarschalkerweerd, Rolf, Mance, Davor, Meshksar, Neda, Martın, V, Martin-Polo, L, Martino, Joseph, Martin-Porqueras, Fernando, Mateos, Ignacio, McNamara, Paul, Mendes, Jose, Mendes, Luis, Nofrarias, Miquel, Paczkowski, Sarah, Perreur-Lloyd, Michael, Petiteau, Antoine, Pivato, Paolo, Plagnol, Eric, Ramos-Castro, Jose, Reiche, Jens, Robertson, David, Rivas, Francisco, Russano, Giuliana, Slutsky, Jacob, Sopuerta, Carlos, Sumner, Timothy, Texier, Daniel, Thorpe, Ira, Vetrugno, Daniele, Vitale, Stefano, Wanner, Gudrun, Ward, Harry, Wass, Peter, Weber, William, Wissel, Lennart, Wittchen, Andreas, and Zweifel, Peter

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Since the 2017 Nobel Prize in Physics was awarded for the observation of gravitational waves, it is fair to say that the epoch of gravitational wave astronomy (GWs) has begun. However, a number of interesting sources of GWs can only be observed from space. To demonstrate the feasibility of the Laser Interferometer Space Antenna (LISA), a future gravitational wave observatory in space, the LISA Pathfinder satellite was launched on December, 3rd 2015. Measurements of the spurious forces accelerating an otherwise free-falling test mass, and detailed investigations of the individual subsystems needed to achieve the free-fall, have been conducted throughout the mission. This overview article starts with the purpose and aim of the mission, explains satellite hardware and mission operations and ends with a summary of selected important results and an outlook towards LISA. From the LISA Pathfinder experience, we can conclude that the proposed LISA mission is feasible., Comment: Preprint of an article submitted for consideration in Lepton-Photon 2017 conference proceedings \copyright 2019 copyright World Scientific Publishing Company

Published
2019

14. Social Insurance

Author

Zweifel, Peter, Eisen, Roland, Eckles, David L., Zweifel, Peter, Eisen, Roland, and Eckles, David L.

Published
2021
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15. LISA Pathfinder Platform Stability and Drag-free Performance

Author

Armano, Michele, Audley, Heather, Baird, Jonathon, Binetruy, Pierre, Born, Michael, Bortoluzzi, Daniele, Castelli, Eleanora, Cavalleri, Antonella, Cesarini, Andrea, Cruise, Mike, Danzmann, Karsten, Silva, Marcus de Deus, Diepholz, Igo, Dixon, George, Dolesi, Rita, Ferraioli, Luigi, Ferroni, Valerio, Fitzsimons, Ewan, Freschi, Mario, Gesa, Luis, Gibert, Ferran, Giardini, Domenico, Giusteri, Roberta, Grimani, Catia, Grzymisch, Jonathan, Harrison, Ian, Heinzel, Gerhard, Hewitson, Martin, Hollington, Daniel, Hoyland, David, Hueller, Mauro, Inchauspe, Henri, Jennrich, Oliver, Jetzer, Philippe, Karnesis, Nikolaos, Kaune, Brigitte, Korsakova, Natalia, Killow, Christian J, Lobo, Alberto, Lloro, Ivan, Liu, Li, Lopez-Zaragoza, Juan-Pedro P, Maarschalkerweerd, Rolf, Mance, Davor, Meshksar, Neda, Martın, V, Martin-Polo, L, Martino, Joseph, Martin-Porqueras, Fernando, Mateos, Ignacio, McNamara, Paul, Mendes, Jose, Mendes, Luis, Nofrarias, Miquel, Paczkowski, Sarah, Perreur-Lloyd, Michael, Petiteau, Antoine, Pivato, Paolo, Plagnol, Eric, Ramos-Castro, Jose, Reiche, Jens, Robertson, David, Rivas, Francisco, Russano, Giuliana, Slutsky, Jacob, Sopuerta, Carlos, Sumner, Timothy, Texier, Daniel, Thorpe, Ira, Vetrugno, Daniele, Vitale, Stefano, Wanner, Gudrun, Ward, Harry, Wass, Peter, Weber, William, Wissel, Lennart, Wittchen, Andreas, and Zweifel, Peter

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The science operations of the LISA Pathfinder mission has demonstrated the feasibility of sub-femto-g free-fall of macroscopic test masses necessary to build a LISA-like gravitational wave observatory in space. While the main focus of interest, i.e. the optical axis or the $x$-axis, has been extensively studied, it is also of interest to evaluate the stability of the spacecraft with respect to all the other degrees of freedom. The current paper is dedicated to such a study, with a focus set on an exhaustive and quantitative evaluation of the imperfections and dynamical effects that impact the stability with respect to its local geodesic. A model of the complete closed-loop system provides a comprehensive understanding of each part of the in-loop coordinates spectra. As will be presented, this model gives very good agreements with LISA Pathfinder flight data. It allows one to identify the physical noise source at the origin and the physical phenomena underlying the couplings. From this, the performances of the stability of the spacecraft, with respect to its geodesic, are extracted as a function of frequency. Close to $1 mHz$, the stability of the spacecraft on the $X_{SC}$, $Y_{SC}$ and $Z_{SC}$ degrees of freedom is shown to be of the order of $5.0\ 10^{-15} m\ s^{-2}/\sqrt{Hz}$ for X and $4.0 \ 10^{-14} m\ s^{-2}/\sqrt{Hz}$ for Y and Z. For the angular degrees of freedom, the values are of the order $3\ 10^{-12} rad\ s^{-2}/\sqrt{Hz}$ for $\Theta_{SC}$ and $3\ 10^{-13} rad\ s^{-2}/\sqrt{Hz}$ for $H_{SC}$ and $\Phi_{SC}$., Comment: 16 pages, 10 figures

Published
2018
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16. Laser Interferometer Space Antenna

Author

Amaro-Seoane, Pau, Audley, Heather, Babak, Stanislav, Baker, John, Barausse, Enrico, Bender, Peter, Berti, Emanuele, Binetruy, Pierre, Born, Michael, Bortoluzzi, Daniele, Camp, Jordan, Caprini, Chiara, Cardoso, Vitor, Colpi, Monica, Conklin, John, Cornish, Neil, Cutler, Curt, Danzmann, Karsten, Dolesi, Rita, Ferraioli, Luigi, Ferroni, Valerio, Fitzsimons, Ewan, Gair, Jonathan, Bote, Lluis Gesa, Giardini, Domenico, Gibert, Ferran, Grimani, Catia, Halloin, Hubert, Heinzel, Gerhard, Hertog, Thomas, Hewitson, Martin, Holley-Bockelmann, Kelly, Hollington, Daniel, Hueller, Mauro, Inchauspe, Henri, Jetzer, Philippe, Karnesis, Nikos, Killow, Christian, Klein, Antoine, Klipstein, Bill, Korsakova, Natalia, Larson, Shane L, Livas, Jeffrey, Lloro, Ivan, Man, Nary, Mance, Davor, Martino, Joseph, Mateos, Ignacio, McKenzie, Kirk, McWilliams, Sean T, Miller, Cole, Mueller, Guido, Nardini, Germano, Nelemans, Gijs, Nofrarias, Miquel, Petiteau, Antoine, Pivato, Paolo, Plagnol, Eric, Porter, Ed, Reiche, Jens, Robertson, David, Robertson, Norna, Rossi, Elena, Russano, Giuliana, Schutz, Bernard, Sesana, Alberto, Shoemaker, David, Slutsky, Jacob, Sopuerta, Carlos F., Sumner, Tim, Tamanini, Nicola, Thorpe, Ira, Troebs, Michael, Vallisneri, Michele, Vecchio, Alberto, Vetrugno, Daniele, Vitale, Stefano, Volonteri, Marta, Wanner, Gudrun, Ward, Harry, Wass, Peter, Weber, William, Ziemer, John, and Zweifel, Peter

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Following the selection of The Gravitational Universe by ESA, and the successful flight of LISA Pathfinder, the LISA Consortium now proposes a 4 year mission in response to ESA's call for missions for L3. The observatory will be based on three arms with six active laser links, between three identical spacecraft in a triangular formation separated by 2.5 million km. LISA is an all-sky monitor and will offer a wide view of a dynamic cosmos using Gravitational Waves as new and unique messengers to unveil The Gravitational Universe. It provides the closest ever view of the infant Universe at TeV energy scales, has known sources in the form of verification binaries in the Milky Way, and can probe the entire Universe, from its smallest scales near the horizons of black holes, all the way to cosmological scales. The LISA mission will scan the entire sky as it follows behind the Earth in its orbit, obtaining both polarisations of the Gravitational Waves simultaneously, and will measure source parameters with astrophysically relevant sensitivity in a band from below $10^{-4}\,$Hz to above $10^{-1}\,$Hz., Comment: Submitted to ESA on January 13th in response to the call for missions for the L3 slot in the Cosmic Vision Programme

Published
2017

28. External Costs

Author

Zweifel, Peter, Praktiknjo, Aaron, Erdmann, Georg, Zweifel, Peter, Praktiknjo, Aaron, and Erdmann, Georg

Published
2017
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34. Introduction

Author

Zweifel, Peter, Praktiknjo, Aaron, Erdmann, Georg, Zweifel, Peter, Praktiknjo, Aaron, and Erdmann, Georg

Published
2017
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40. Why ‘Optimal’ Payment for Healthcare Providers Can Never Be Optimal Under Community Rating

Author

Frech, Ted E and Zweifel, Peter

Subjects
Community Rating, Health Insurance, Optimal Payment
Abstract

This article extends the received literature on optimal provider payment by accounting for consumer heterogeneity in preferences for health insurance and health care. This heterogeneity breaks down the separation of the relationship between providers and the health insurer and the relationship between consumers and the insurer. Both experimental and market evidence for a high degree of heterogeneity are presented. Given heterogeneity, a uniform policy fails to effectively control moral hazard, while incentives for risk selection created by community rating cannot be neutralized through risk adjustment. Consumer heterogeneity spills over into relationships with providers, such that a uniform contract with providers cannot be optimal either. The decisive condition for ensuring optimality of provider payment is to replace community rating (which violates the principle of marginal cost pricing) by risk-rating of contributions combined with subsidization targeted at high risks with low incomes.

Published
2015

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