Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session G05: Dynamics of Relativistic Plasmas
8:30 AM–10:18 AM,
Sunday, April 10, 2022
Sponsoring Units: DCOMP DNP
Chair: Jacquelyn Noronha-Hostler, University of Illinois at Urbana-Champaign
Abstract: G05.00003 : Simulating extreme plasmas in neutron star mergers and beyond
9:42 AM–10:18 AM
Elias R Most
Elias R Most
In this talk, I will present recent advances in the state-of-the-art modeling of relativistic plasmas applicable to neutron star mergers and beyond.
Starting from hot and dense plasmas formed during the collision of two neutron stars, I will present novel insights into how these plasmas might be obtainable in ground-based experiments. I will then discuss why dissipative effects (e.g., weak-interaction driven bulk viscosity) might be crucial for understanding the post-merger evolution of a binary neutron star coalescence. Going to plasmas at densities below saturation, I will comment on the importance of magnetic fields and relativistic turbulence during the collision. Furthermore, I will present a systematic study of the emission of electromagnetic (EM) flares from the inspiral that can drive powerful EM precursors to gravitational wave events.
The next-generation modeling of relativistic plasmas in these extreme regimes requires the consistent inclusion of dissipative effects into numerical magnetohydrodynamics (MHD) simulations. To this end, I will introduce a novel 14-moment based numerical approach to dissipative relativistic MHD. This 14-moment closure can seamlessly interpolate between the highly collisional limit found in neutron star mergers and heavy-ion collisions, and the weakly coupled Braginskii-like limit of extended MHD appropriate for the study of accretion disks around supermassive black holes. Going beyond these collisional limits, I will also provide an outlook on how to describe the collisionless dynamics of electron-ion/positron plasmas using dissipative two-fluid MHD.
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