Handing-Off the Outcome of Binary Neutron Star Mergers for Accurate and Long-Term Post-Merger Simulations
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2021-12-18
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
We perform binary neutron star (BNS) merger simulations in full dynamical general relativity
with IllinoisGRMHD, on a Cartesian grid with adaptive-mesh refinement. After the remnant
black hole (BH) has become nearly stationary, the evolution of the surrounding accretion disk on
Cartesian grids over long timescales (∼1s) is suboptimal, as the plasma flows obliquely across co-ordinate lines and numerical errors quickly dissipate angular momentum from the disk. To address
this, we present the HandOff, a set of computational tools that enables the transfer of general rela tivistic magnetohydrodynamic (GRMHD) and spacetime data from IllinoisGRMHD to Harm3d,
a GRMHD code that specializes in modeling BH accretion disks in static spacetimes over long
timescales, making use of general coordinate systems with spherical topology. We demonstrate that
the HandOff allows for a smooth and reliable transition of GRMHD fields and spacetime data,
enabling us to efficiently and reliably evolve BNS dynamics well beyond merger. We also discuss
future plans, which involve incorporating advanced equations of state and neutrino physics into BNS
simulations using the HandOff approach.