Bulletin of the American Physical Society
2007 APS Four Corners Section/SPS Zone 16 Joint Fall Meeting
Volume 52, Number 14
Friday–Saturday, October 19–20, 2007; Flagstaff, Arizona
Session K2: General Relativity |
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Chair: Ralph Baierlein, Northern Arizona University Room: Chemistry (Bldg. 20) Room 225 |
Saturday, October 20, 2007 2:00PM - 2:36PM |
K2.00001: Gravitational waves, neutron stars, and black holes Invited Speaker: The observation of gravitational waves will provide a new method for studying the universe. The strongest sources of gravitational waves are expected to be inspiralling binary black holes and neutron stars. This talk will review efforts to detect gravitational waves, and complementary efforts to predict these signals by solving the Einstein field equations of general relativity. Binaries with neutron stars are particularly interesting both for the rich physics of these stars, and because they may be progenitors for short, hard gamma-ray bursts. In the merger of two neutron stars, the final state may be either a strongly differentially rotating star or a black hole. Computational results showing both scenarios will be presented with gravitational wave extraction. [Preview Abstract] |
Saturday, October 20, 2007 2:36PM - 2:48PM |
K2.00002: Effective field theory of gravitational radiation Delphine Perrodin Predicted by general relativity but not yet directly observed, gravitational waves could soon be detected at the Laser Interferometer Gravitational-Wave Observatory (LIGO). Coalescing compact binaries are powerful emitters of gravitational waves and provide a strong gravity environment ideal for the testing of gravity theories. We study the gravitational wave emission in non-relativistic binary systems, using an effective field theory formalism introduced by Goldberger \& Rothstein, which takes into account the different scales involved. This formalism is applicable to all orders in the orbital velocity, surpassing previous post-newtonian calculations. We are especially interested in how the formalism can be applied to test alternative theories of gravity. This work has been done in collaboration with Sean Fleming. [Preview Abstract] |
Saturday, October 20, 2007 2:48PM - 3:00PM |
K2.00003: Modeling Galaxies in General Relativity Ryan Tanner Recently there has been some interest in relativistic models of galaxies which may give some correction to estimates of how much dark matter is present in a galaxy. There have been claims that the extent of the correction given by general relativity can remove the need to include dark matter in order to reproduce the flat rotation curves typical of galaxies. The method employed to make this claim involves treating a galaxy as a van Stockum dust, or pressureless fluid. I will consider this claim and investigate the problems and objections associated with this method, as it allows for closed timelike curves and disks of infinite density. [Preview Abstract] |
Saturday, October 20, 2007 3:00PM - 3:12PM |
K2.00004: A Continuing Study of Chaos in the Three Body Problem Miriam Neubauer, J.J. Campbell, David Tanner, David Neilsen Little is known about chaos in general relativity, Einstein's theory of gravitation. We investigate chaos in the general relativistic three-body problem by studying the scattering of a single object from a binary pair. The gravitational equations are solved in the post-Newtonian approximation. We present results with both equal mass and unequal mass binaries. [Preview Abstract] |
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