Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session Y01: Challenges and Advances in Numerical RelativityInvited Live Streamed
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Sponsoring Units: DGRAV DCOMP Chair: Thomas Baumgarte, Bowdoin College Room: Broadway North |
Tuesday, April 12, 2022 1:30PM - 2:06PM |
Y01.00001: Numerical Relativity: Key Insights, Challenges, and Prospects for the Future Invited Speaker: Manuela Campanelli Gravitational-waves observations of several binary compact mergers heralded in a new kind of astronomy, one integrating its findings with those obtained from electromagnetic and/or neutrino observations. Multi-messenger astronomy promises to revolutionize our understanding of the universe by providing dramatically contrasting views of the same objects. To understand this unprecedented wealth of observational evidence, theoretical calculations are required in order to link data with underlying physics. However, these demand the creation of new computational tools that can handle an increasingly wide range of physical treatments, characteristic scales, and levels of complexity. I will present here my perspective on some of the key challenges and new exciting developments in the field of numerical relativity and computational astrophysics, keeping an eye on the future. |
Tuesday, April 12, 2022 2:06PM - 2:42PM |
Y01.00002: General-Relativistic Magnetohydrodynamics Effects in Neutron Star Mergers Invited Speaker: David Radice The postmerger evolution of binary neutron star systems determines to a large extent the qualitative and quantitative features of the electromagnetic emission and nucleosynthesis yields from these events. Multimessenger signals from neutron star merger remnants could constrain the properties of matter and gravity in otherwise inaccessible regimes. However, reliable theoretical models need to be developed in order to interpret and guide upcoming observations. This is challenging because of the rich physics and complex nonlinear magnetohydrodynamics phenomena that are expected to take place. This talk will review the current understanding of magnetohydrodynamics turbulence in neutron star mergers and its impact on their multimessenger signal. I will discuss the simulation techniques used to model the postmerger phase of binary neutron star mergers, highlighting recent progress and open problems. |
Tuesday, April 12, 2022 2:42PM - 3:18PM |
Y01.00003: Neutrino Kinetics in Neutron Star Mergers Invited Speaker: Sherwood A Richers Following a neutron star merger, neutrinos are the primary means of cooling the resulting accretion disk and remnant compact object, they drive outflows, and they determine the abundances of elements formed in the ejecta. State-of-the-art numerical relativity simulations of these mergers employ a variety of methods for accounting for this radiation transport at differing levels of cost, complexity, and accuracy. I will briefly justify the local interaction approximation that is the basis for all current methods, describe the place each class of methods has in current science goals, and divine the future needs of relativistic radiation transport. Furthermore, I will introduce current efforts to understand the effects of the quantum nature of neutrino flavor and spin, including numerical methods, microscopic instabilities, and attempts at parameterizing sub-grid models of neutrino flavor transformation for inclusion in global numerical relativity simulations. |
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