The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project

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.

Daniel C. M. Palumbo | Chih-Wei L. Huang | Alexander W. Raymond | H. Falcke | T. Lauer | K. Bouman | Bill Freeman | G. Desvignes | S. Ikeda | J. Carlstrom | Z. Etienne | D. James | P. Koch | L. Rezzolla | K. Menten | R. Neri | P. Ho | L. Blackburn | J. Cordes | E. Ros | Sang-Sung Lee | M. Kino | S. Trippe | Guangyao Zhao | D. Byun | M. Gurwell | Jae-Young Kim | P. Galison | M. Hecht | C. Gammie | N. Patel | M. Inoue | F. Schloerb | Jongsoo Kim | R. Narayan | Michael D. Johnson | S. Doeleman | J. Wardle | S. Chatterjee | L. Loinard | F. Roelofs | D. Psaltis | J. Weintroub | A. Rogers | R. Plambeck | R. Tilanus | P. Friberg | J. Moran | K. Young | M. Titus | D. Marrone | T. Krichbaum | A. Roy | V. Fish | K. Akiyama | A. Lobanov | A. Broderick | M. Honma | T. Oyama | J. SooHoo | F. Tazaki | A. Chael | K. Asada | C. Brinkerink | G. Crew | R. Gold | J. Zensus | J. Stone | S. Noble | R. Karuppusamy | Kuo Liu | P. Torne | I. Martí-Vidal | N. Nagar | D. Hughes | Ming-Tang Chen | R. Hesper | Ziyan Zhu | K. Toma | M. Sasada | D. Pesce | P. Tiede | H. Pu | A. Marscher | S. Jorstad | U. Pen | P. Anninos | J. Baker | I. Bemmel | D. Bintley | B. Jannuzi | A. Young | E. Fomalont | K. Chatterjee | I. Natarajan | A. Alberdi | W. Alef | R. Azulay | A. Baczko | D. Ball | M. Baloković | J. Barrett | W. Boland | M. Bremer | R. Brissenden | S. Britzen | T. Bronzwaer | Chi-kwan Chan | I. Cho | P. Christian | Yuzhu Cui | J. Davelaar | R. Deane | J. Dempsey | R. Eatough | R. Fraga-Encinas | C. Fromm | O. Gentaz | B. Georgiev | K. Hada | S. Issaoun | M. Janssen | B. Jeter | T. Jung | M. Karami | T. Kawashima | G. Keating | M. Kettenis | Junhan Kim | J. Koay | S. Koyama | C. Kuo | M. Lindqvist | E. Liuzzo | W. Lo | C. Lonsdale | N. MacDonald | S. Markoff | S. Matsushita | L. Matthews | L. Medeiros | Y. Mizuno | I. Mizuno | K. Moriyama | M. Mościbrodzka | C. Müller | H. Nagai | G. Narayanan | C. Ni | A. Noutsos | H. Okino | H. Olivares | D. Palumbo | V. Piétu | A. PopStefanija | O. Porth | B. Prather | J. A. Preciado-López | V. Ramakrishnan | M. Rawlings | B. Ripperda | M. Rose | A. Roshanineshat | H. Rottmann | C. Ruszczyk | B. Ryan | K. Rygl | S. Sánchez | D. Sánchez-Arguelles | T. Savolainen | K. Schuster | D. Small | B. Sohn | T. Trent | S. Tsuda | N. Wex | R. Wharton | M. Wielgus | G. Wong | Z. Younsi | Shan-Shan Zhao | L. Zanna | H. V. van Langevelde | J. Conway | M. De Laurentis | F. Özel | R. Rao | D. V. van Rossum | C. Kramer | M. Liška | P. C. Fragile | B. Mishra | B. Kelly | N. Tomei | M. Bugli | D. Broguiere | Lei 磊 Huang 黄 | Wu 悟 Jiang 江 | J. Gómez | C. White | M. Nakamura | J. McKinney | C. Goddi | Lijing Shao | J. Wagner | F. Yuan 袁 | G. Bower | Zhiqiang 强 Shen 沈志 | Yongjun 军 Chen 陈永 | R. García | Minfeng 峰 Gu 顾敏 | Luis C. 山 Ho 何子 | M. Kramer | Yan-Rong 荣 Li 李彦 | Zhiyuan 远 Li 李志 | Ru-Sen 森 Lu 路如 | Jirong 荣 Mao 毛基 | A. Raymond | Qingwen 文 Wu 吴庆 | Ye-Fei 飞 Yuan 袁业 | L. Huang 黄 | M. Liska | David Ball | Shiro Ikeda | Aleksandar PopStefanija | Olivier Gentaz | Britton Jeter | C. Kuo | Wen-Ping Lo | Kotaro Moriyama | Jorge A. Preciado-López | Hung-Yi Pu | Ramprasad Rao | Arash Roshanineshat | Daniel R. van Rossum | Niccolò Tomei | D. Hughes

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