Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session Q01: Progress in Analytical General RelativityInvited Live

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Sponsoring Units: DGRAV Chair: James Isenberg, University of Oregon 
Monday, April 19, 2021 10:45AM  11:21AM Live 
Q01.00001: New Structures in Gravitational Radiation Invited Speaker: Lydia Bieri Gravitational waves transport information from faraway regions of the Universe. Most studies so far have been devoted to sources like binary black hole mergers or neutron star mergers, or generally to sources that are stationary outside of a compact set. We describe these systems by asymptoticallyflat manifolds solving the Einstein equations. These sources have in common that far away their gravitational field decays fast enough towards Minkowski spacetime. In particular, far away from the source, the decay behavior can be described by a term that is homogeneous of degree (1) and lower order terms. I will present new results on gravitational radiation for sources that are not stationary outside of a compact set, but whose gravitational fields decay more slowly towards infinity. A panorama of new gravitational effects opens up when delving deeper into these more general spacetimes. In particular, whereas the former sources produce memory effects that are of purely electric parity (permanent displacement only), the latter in addition generate memory of magnetic type, thus allowing for rotation in the system. These new effects emerge naturally from the Einstein equations. [Preview Abstract] 
Monday, April 19, 2021 11:21AM  11:57AM Live 
Q01.00002: The Nonlinear Stability of Black Holes Invited Speaker: Mihalis Dafermos I will discuss the mathematical status of the problem of the nonlinear stability of black holes in classical general relativity. [Preview Abstract] 
Monday, April 19, 2021 11:57AM  12:33PM Live 
Q01.00003: Some Rigorous Results about the Past and Future Behavior of Expanding Vacuum Spacetimes Invited Speaker: John Lott It's an old problem to understand the asymptotic geometry of an expanding vacuum spacetime as one approaches an initial singularity, or as one goes to the future. The best results assume some continuous symmetries. I will discuss recent work that does not involve any symmetry assumptions, but does have a reasonable scaleinvariant curvature assumption. In particular, one goal is to characterize the existence of Kasnerlike regions near an initial crushing singularity. [Preview Abstract] 
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