The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project

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Abstract

Recent developments in compact object astrophysics, especially the discovery of merging neutron stars by LIGO, the imaging of the black hole in M87 by the Event Horizon Telescope, and high- precision astrometry of the Galactic Center at close to the event horizon scale by the GRAVITY experiment motivate the development of numerical source models that solve the equations of general relativistic magnetohydrodynamics (GRMHD). Here we compare GRMHD solutions for the evolution of a magnetized accretion flow where turbulence is promoted by the magnetorotational instability from a set of nine GRMHD codes: Athena++, BHAC, Cosmos++, ECHO, H-AMR, iharm3D, HARM-Noble, IllinoisGRMHD, and KORAL. Agreement among the codes improves as resolution increases, as measured by a consistently applied, specially developed set of code performance metrics. We conclude that the community of GRMHD codes is mature, capable, and consistent on these test problems.

Original languageEnglish
Article number26
Number of pages40
JournalAstrophysical Journal Supplement Series
Volume243
Issue number2
DOIs
Publication statusPublished - Aug 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • black hole physics
  • magnetic fields
  • magnetohydrodynamics (MHD)
  • methods: numerical
  • relativistic processes
  • BLACK-HOLE ACCRETION
  • ADVECTION-DOMINATED ACCRETION
  • SGR A-ASTERISK
  • GODUNOV-TYPE SCHEMES
  • MAGNETOROTATIONAL INSTABILITY
  • MAGNETIZED ACCRETION
  • EDDINGTON ACCRETION
  • GLOBAL SIMULATIONS
  • NUMERICAL SCHEME
  • NEUTRON-STARS

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