The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project
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https://arxiv.org/pdf/1904.04923.pdfPermanent Link
http://hdl.handle.net/11603/13879Collections
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2019-04-11Type of Work
51 pagesText
journal articles preprints
Citation of Original Publication
Oliver Porth, et.al, The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project, 2019, https://arxiv.org/pdf/1904.04923.pdfRights
This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Subjects
numerical methodsmagnetohydrodynamics (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.