Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session U14: Numerical Relativity Simulations of Compact Binary MergersInvited
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Sponsoring Units: DGRAV DCOMP Chair: Carlos Lousto, Rochester Institute of Technology Room: Washington 1 |
Monday, January 30, 2017 3:30PM - 4:06PM |
U14.00001: Simulations of binary black hole mergers Invited Speaker: Geoffrey Lovelace Advanced LIGO’s observations of merging binary black holes have inaugurated the era of gravitational wave astronomy. Accurate models of binary black holes and the gravitational waves they emit are helping Advanced LIGO to find as many gravitational waves as possible and to learn as much as possible about the waves’ sources. These models require numerical-relativity simulations of binary black holes, because near the time when the black holes merge, all analytic approximations break down. Following breakthroughs in 2005, many research groups have built numerical-relativity codes capable of simulating binary black holes. In this talk, I will discuss current challenges in simulating binary black holes for gravitational-wave astronomy, and I will discuss the tremendous progress that has already enabled such simulations to become an essential tool for Advanced LIGO. [Preview Abstract] |
Monday, January 30, 2017 4:06PM - 4:42PM |
U14.00002: The exotic remnants of compact object binary mergers Invited Speaker: Matthew Duez The collision and merger of a neutron star with a black hole or another neutron star is a strong source of gravitational waves and a promising setup for the creation of bright infrared (kilonova) and gamma ray (gamma ray burst) transients. These violent events can be modeled by numerical simulations incorporating general relativity, fluid dynamics, and nuclear physics. In this talk, I will explain the findings of some of these simulations. Depending on the properties of the binary, the merger leaves a black hole, a black hole accreting matter from a torus at an incredible rate, or a massive spinning neutron star. The latter two cases are characterized by the importance of differential rotation, magnetohydrodynamic processes, and neutrino radiation. To understand these systems, I will focus on what we know of their dynamical and thermal equilibrium structure, what we know of the dynamical instabilities to which they might be prone, and what we can tentatively say about their subsequent secular evolution from outflow, magnetic, radiative, and other effects. Computer simulations are becoming ever more impressive but remain unequal to the problem at hand, so I will address the challenges still posed by small-scale magnetohydrodynamic effects and by radiation transport. [Preview Abstract] |
Monday, January 30, 2017 4:42PM - 5:18PM |
U14.00003: Simulations of binary neutron star mergers Invited Speaker: Kenta Kiuchi The merger of a binary composed of a neutron star and/or a black hole is one of the most promising sources of gravitational waves. If we detected gravitational waves from them, it could tell us a validity of the general relativity in a strong gravitational field and the equation of state of neutron star matter. Furthermore, if gravitational waves from a compact binary merger and a short-hard gamma-ray burst are observed simultaneously, a long-standing puzzle on the central engine of short gamma-ray bursts could be resolved. In addition, compact binary mergers are a theoretical candidate of the rapid process nucleosynthesis site. Motivated by these facts, it is mandatory to build a physically reliable model of compact binary mergers and numerical relativity is a unique approach for this purpose. We are tackling this problem from several directions; the magneto-hydrodynamics, the neutrino radiation transfer, and a comprehensive study with simplified models. I will talk a current status of Kyoto Numerical Relativity group and future prospect on the compact binary mergers. [Preview Abstract] |
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