The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project

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1904.04923.pdf (9.88 MB)

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https://arxiv.org/pdf/1904.04923.pdf

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http://hdl.handle.net/11603/13879

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UMBC Physics Department
UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection

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2019-04-11

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journal articles preprints
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Citation of Original Publication

Oliver Porth, et.al, The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project, 2019, https://arxiv.org/pdf/1904.04923.pdf

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Subjects

numerical methods
magnetohydrodynamics (MHD)
magnetic fields
general relativity
black hole physics

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 (EHT) 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 between 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.