Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session S4: Gravity in Extreme Conditions |
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Sponsoring Units: DCOMP GGR Chair: Luis Lehner, Louisiana State University Room: Thurgood Marshall North |
Monday, February 15, 2010 3:30PM - 4:06PM |
S4.00001: Computational Models of Stellar Collapse, Core-Collapse Supernovae, and Black Hole Formation Invited Speaker: I present an overview on the recent progress in the computational modeling of the core collapse of massive stars and the subsequent core-collapse supernova evolution. Despite many decades of theoretical and computational work, the precise mechanism driving core-collapse supernova explosions remains to be understood, but may involve (a combination of) post-core-bounce energy deposition by neutrinos, convective instability, the standing-accretion-shock instability (SASI), protoneutron star pulsations, rotational, and magneto-hydrodynamic effects. I introduce the ensemble of presently considered explosion mechanisms and show, on the basis of new Newtonian and general relativistic simulations, that gravitational waves emitted in a core collapse event can be used to distinguish between these proposed mechanisms. I go on to discuss the case in which the explosion fails and the neutron star is pushed over its maximum mass by continued accretion. I present new results on this process obtained with general relativistic hydrodynamics simulations of nonrotating and rotating stellar collapse and postbounce evolution using an approximate scheme for neutrino cooling and heating and a variety of microphysical finite-temperature equations of state. [Preview Abstract] |
Monday, February 15, 2010 4:06PM - 4:42PM |
S4.00002: Aneesur Rahman Prize for Computational Physics Talk: Black Hole Collisions Invited Speaker: The class of spacetimes describing the merger of two black holes contain some of the most fascinating solutions to the equations of general relativity. In this talk I will review what has been learnt about the binary black hole problem over the past several years from numerical simulations of the Einstein field equations, focusing on the more ``extreme'' solutions obtained in the high velocity limit. This is of possible relevance to LHC and cosmic ray physics in certain proposed large extra dimension scenarios. Some of the interesting results include the near-Planck scale luminosity in radiated gravitational waves, recoil velocities of on the order of ten thousand kilometers per second or larger, zoom-whirl orbital motion, the formation of near-extremal Kerr black holes, and that in the ultra relativistic limit the internal nature of the colliding object, whether black holes or not, seemingly becomes irrelevant. [Preview Abstract] |
Monday, February 15, 2010 4:42PM - 5:18PM |
S4.00003: Status Report on Black Hole Critical Behavior Invited Speaker: In 1993 Choptuik found interesting nonlinear behavior near the threshold of black hole formation in the collapse of a real scalar field. His discovery set-off a flurry of further studies revealing such phenomena in many other models, as well as similar behavior in models without black holes. I review the current understanding produced by much of this work and also emphasize remaining questions. [Preview Abstract] |
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