Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session L06: Tests of General RelativityInvited Live
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Sponsoring Units: DGRAV Chair: Kent Yagi, University of Virginia Room: Roosevelt 1 |
Sunday, April 19, 2020 3:30PM - 4:06PM Live |
L06.00001: Zombie alert! Solar system tests of GR are still alive Invited Speaker: Clifford Will We have entered an era of testing general relativity in the strong-field, dynamical regime, using gravitational wave detections, direct observations of neutron stars and black holes, and cosmological observations. Yet, like the zombies of cinema, solar system tests continue to trudge along, adding new and interesting constraints on gravitational theories, while fortunately not devouring everything in their wakes. In this talk, we review some recent results, including tests of the equivalence principle using the MICROSCOPE and Galileo satellites, a test of light bending performed by an amateur astronomer, new bounds on frame dragging from the LAGEOS/LARES satellites, and a bound on the graviton mass from solar system ephemeris data. We also describe future tests that could come from the BepiColombo Mercury orbiters, the ACES clock experiment on the Space Station, and from the GAIA astrometry satellite. [Preview Abstract] |
Sunday, April 19, 2020 4:06PM - 4:42PM Live |
L06.00002: Gravitational-wave tests of GR with simulations of beyond-GR theories Invited Speaker: Leo Stein Present and next generation gravitational-wave observatories bring the opportunity for precision tests of general relativity. To compare GR vs. beyond-GR (BGR) requires the BGR waveforms have the same level of sophistication as available for GR. In the nonlinear regime of black hole mergers, GR waveform predictions rely on numerical simulations. Meanwhile, BH merger simulations have only recently become possible in theories like Einstein-dilaton-Maxwell, dynamical Chern-Simons gravity, or Einstein-dilaton-Gauss-Bonnet. We highlight some of the recent advances in numerical simulations of beyond-GR theories, and discuss some conceptual and computational issues in treating these theories. We will also examine the difficulty of secular effects, and prospects for completing the waveform modeling problem in beyond-GR theories. [Preview Abstract] |
Sunday, April 19, 2020 4:42PM - 5:18PM Live |
L06.00003: Tests of General Relativity with Black Hole Shadows Invited Speaker: Dimitrios Psaltis The imaging of black-hole shadows with the Event Horizon Telescope has opened a new window into the strong-field spacetimes of these extreme astrophysical objects. For the Kerr spacetime, the shadow of a black hole is nearly circular with a size that depends almost entirely on its mass. I will describe how this property of Kerr shadows allows us to perform null-hypothesis tests of General Relativity, when the mass of the black hole is known a priori. I will discuss metrics that deviate from Kerr and their signatures related to the shapes and sizes of black-hole shadows. I will conclude with a prognosis on what ground-based observations of shadows can tell us about black-hole metrics and the underlying theory of gravity. [Preview Abstract] |
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