Handing off the outcome of binary neutron star mergers for accurate and long-term postmerger simulations

Lopez Armengol, Federico G.; Etienne, Zachariah B.; Noble, Scott C.; Kelly, Bernard J.; Werneck, Leonardo R.; Drachler, Brendan; Campanelli, Manuela; Cipolletta, Federico; Zlochower, Yosef; Murguia-Berthier, Ariadna; Ennoggi, Lorenzo; Avara, Mark; Ciolfi, Riccardo; Faber, Joshua; Fiacco, Grace; Giacomazzo, Bruno; Gupte, Tanmayee; Ha, Trung; Krolik, Julian H.; Mewes, Vassilios; O’Shaughnessy, Richard; Rueda-Becerril, Jesús M.; Schnittman, Jeremy

doi:10.1103/physrevd.106.083015

Title: Handing off the outcome of binary neutron star mergers for accurate and long-term postmerger simulations

Journal Article · Thu Oct 20 00:00:00 EDT 2022 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.106.083015· OSTI ID:1895211

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Rochester Inst. of Technology, Rochester, NY (United States)
Univ. of Idaho, Moscow, ID (United States); West Virginia Univ., Morgantown, WV (United States)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Rochester Inst. of Technology, Rochester, NY (United States); Leonardo Corporate LABS, Genova (Italy)
Univ. of California, Santa Cruz, CA (United States); Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Evanston, IL (United States); National Aeronautics and Space Administration (NASA), Washington, DC (United States)
Istituto Nazionale di Astrofisica (INAF), Padova (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy)
Rochester Inst. of Technology, Rochester, NY (United States); Montana State Univ., Bozeman, MT (United States)
Univ. degli Studi di Milano (Italy); National Inst. of Nuclear Physics (INFN), Milan (Italy); Istituto Nazionale di Astrofisica (INAF), Merate (Italy)
Rochester Inst. of Technology, Rochester, NY (United States); Univ. of North Texas, Denton, TX (United States)
Johns Hopkins Univ., Baltimore, MD (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Center for Computational Sciences (NCCS)

In this work, 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 has become nearly stationary, the evolution of the surrounding accretion disk on Cartesian grids over long timescales (~1s) is suboptimal, as Cartesian coordinates over-resolve the angular coordinates at large distances, and the accreting plasma flows obliquely across coordinate lines dissipating angular momentum artificially from the disk. To address this, we present the HandOff, a set of computational tools that enables the transfer of general relativistic magnetohydrodynamic (GRMHD) and spacetime data from IllinoisGRMHD to harm3d, a GRMHD code that specializes in modeling black hole 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; TCAN-80NSSC18K1488; ISFM-80NSSC18K0538; HST-HF2-51487.001-A; NAS5-26555; PHY-1806596; PHY-2110352; OAC-2004311; PHY-2012057; PHY-1912632; AST-1909534

OSTI ID:: 1895211

Journal Information:: Physical Review. D., Vol. 106, Issue 8; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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