The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project
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.
Keywords
Cite
@article{arxiv.1904.04923,
title = {The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project},
author = {Oliver Porth and Koushik Chatterjee and Ramesh Narayan and Charles F. Gammie and Yosuke Mizuno and Peter Anninos and John G. Baker and Matteo Bugli and Chi-kwan Chan and Jordy Davelaar and Luca Del Zanna and Zachariah B. Etienne and P. Chris Fragile and Bernard J. Kelly and Matthew Liska and Sera Markoff and Jonathan C. McKinney and Bhupendra Mishra and Scott C. Noble and Héctor Olivares and Ben Prather and Luciano Rezzolla and Benjamin R. Ryan and James M. Stone and Niccolò Tomei and Christopher J. White and Ziri Younsi and The Event Horizon Telescope Collaboration},
journal= {arXiv preprint arXiv:1904.04923},
year = {2019}
}
Comments
Accepted version for publication in ApJS (May 28th, 2019)