Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session EE02: V: Mathematical and Numerical Relativity |
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Sponsoring Units: DGRAV Chair: Antonios Tsokaros, University of Illinois at Urbana-Champai Room: Virtual Room 2 |
Monday, April 24, 2023 1:00PM - 1:12PM |
EE02.00001: Angular momentum, fluxes, and angular correlations Adam D Helfer A variety of definitions of angular momentum at null infinity have been proposed. Much of this work is rather formal, and one would like to understand the physical significances of the different proposals, and especially what distinguishes them. |
Monday, April 24, 2023 1:12PM - 1:24PM |
EE02.00002: Vacuum Spacetime With Multipole Moments: Gravitational Wave Observables, Black Hole Shadow and the Minimal Size Conjecture Shammi Tahura, Zhen Pan, Hassan Khalvati, Huan Yang In this work, we explicitly construct the vacuum solution of Einstein's equations with prescribed multipole moments. By observing the behavior of the metric at small distances, we conjecture that for a sufficiently large multipole moment, there is a minimal size below which no object in nature can support such a moment. With the metric of such a spacetime, we discuss the shift of orbital frequencies with respect to those of the Kerr spacetime, for a test particle moving around an object with this set of multipole moments. These frequency shifts are required for the program of mapping out the spacetime multipole moments based on gravitational wave observations of extreme mass ratio inspirals. In addition, we analyze the shape of black hole shadow for various multipole moments and discuss the prospects of constraining the moments from shadow observations. |
Monday, April 24, 2023 1:24PM - 1:36PM |
EE02.00003: Ultimate Black Hole Recoil: What the maximum high energy collisions kick is? Carlos O Lousto, James Healy We performed a series of 1341 full numerical simulations of high |
Monday, April 24, 2023 1:36PM - 1:48PM |
EE02.00004: Massively parallel simulations of binary black holes with Dendro-GR Yosef Zlochower, Milinda Fernando, David W Neilsen, Eric Hirschmann, Hari Sundar, Jackson Bates, Andrew Carroll, Liwei Ji, David Van Komen Dendro-GR uses Wavelet Adaptive Multi-Resolution (WAMR) to generate an unstructured grid adapted to the spacetime geometry together with an octree based data structure. In this talk, we describe the current Dendro-GR algorithm, as well as its advantages and challenges when compared to traditional box-in-box AMR for simulating high-mass ratio black-hole binaries. The advantages include a significantly improved scaling and an associated reductions in "time to solution", as well as a more efficient use of computational resources. Among the challenges (which are not unique to Dendro-GR) is finding an automatic refinement function that efficiently produces high-resolution grids in the required regions without over resolving other regions. |
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