Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session H11: Invited Session: GGR Prize Session |
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Sponsoring Units: GGR Chair: Joey Shapiro Key, University of Texas at Brownsville Room: Key 7 |
Sunday, April 12, 2015 8:30AM - 9:06AM |
H11.00001: Einstein Prize: Black Hole Entropy - Then and Now Invited Speaker: Jacob Bekenstein Forty five year ago black holes were universally regarded as gravitational entities with only mechanical and electrical attributes. There then occurred a shift in thinking and we became accustomed to regard those exotic objects as also subject to thermodynamics. I shall recollect the forerunners of this conceptual change e.g. Hawking's black hole area increase theorem, and some of the steps by which it took place. The transition involved the introduction of black hole entropy and temperature, and the formulation of a generalized version of the second law. This last proved prophetic with the discovery of Hawking's radiance, a phenomenon which transcends the area increase theorem, but upholds the generalized second law. The thermodynamic paradigm for black holes has brought us face to face with subtle issues having to to do with the significance of information in physics, and the seeming collision between gravitational theory and quantum mechanics. Among the concrete fruits of the new way of thinking are various results on the peak information capacity of physical systems, as well as the ``holographic'' approach by which intricate calculations in quantum field theory (with applications to elementary particles or condensed matter physics) can be traded for tractable ones in classical gravity theory. [Preview Abstract] |
Sunday, April 12, 2015 9:06AM - 9:42AM |
H11.00002: MHD-driven Supernovae in Three Dimensions Invited Speaker: Philipp Moesta Core-collapse in rapidly rotating, strongly magnetized progenitors may power some of the most luminous supernovae we observe and possibly set the stage for a subsequent long gamma-ray burst. I will present results of two sets of new three-dimensional (3D) general-relativistic magnetohydrodynamic simulations of core collapse in these progenitors: First, I will discuss how an m=1 kink instability of the ultra-strong toroidal magnetic field affects jet stability and the dynamics, geometry and signature of MHD-driven explosions. In the second part, I will discuss MHD turbulence and its impact on the global field structure in the post-bounce evolution of rapidly rotating proto-neutron stars. [Preview Abstract] |
Sunday, April 12, 2015 9:42AM - 10:18AM |
H11.00003: Spacetime Physics of Force-free Magnetospheres Invited Speaker: Samuel Gralla The spectacular displays of pulsars and quasars are likely energized by rotating compact objects (neutron stars and black holes, respectively) through their plasma magnetospheres. When the magnetic field energy dominates that of the plasma, the system can be described by force-free electrodynamics (FFE), a non-linear, autonomous set of equations for the electromagnetic field on the compact object spacetime. Despite its simple covariant formulation, FFE has primarily been studied in 3+1 frameworks, where spacetime is split into space and time. I will describe new results, techniques and insights from an emerging research program taking a spacetime-geometrical approach to the physics of force-free magnetospheres. [Preview Abstract] |
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