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27 April 2024

» arxiv » 2010.01055

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Gravitational Test Beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole
Dimitrios Psaltis ; Lia Medeiros ; Pierre Christian ; Feryal Ozel ; Kazunori Akiyama ; Antxon Alberdi ; Walter Alef ; Keiichi Asada ; Rebecca Azulay ; David Ball ; Mislav Balokovic ; John Barrett ; Dan Bintley ; Lindy Blackburn ; Wilfred Boland ; Geoffrey C. Bower ; Michael Bremer ; Christiaan D. Brinkerink ; Roger Brissenden ; Silke Britzen ; Dominique Broguiere ; Thomas Bronzwaer ; Do-Young Byun ; John E. Carlstrom ; Andrew Chael ; Chi-kwan Chan ; Shami Chatterjee ; Koushik Chatterjee ; Ming-Tang Chen ; Yongjun Chen ; Ilje Cho ; John E. Conway ; James M. Cordes ; Geoffrey B. Crew ; Yuzhu Cui ; Jordy Davelaar ; Mariafelicia De Laurentis ; Roger Deane ; Jessica Dempsey ; Gregory Desvignes ; Jason Dexter ; Ralph P. Eatough ; Heino Falcke ; Vincent L. Fish ; Ed Fomalont ; Raquel Fraga-Encinas ; Per Friberg ; Christian M. Fromm ; Charles F. Gammie ; Roberto García ; Olivier Gentaz ; Ciriaco Goddi ; Jose L. Gomez ; Minfeng Gu ; Mark Gurwell ; Kazuhiro Hada ; Ronald Hesper ; Luis C. Ho ; Paul Ho ; Mareki Honma ; Chih-Wei L. Huang ; Lei Huang ; David H. Hughes ; Makoto Inoue ; Sara Issaoun ; David J. James ; Buell T. Jannuzi ; Michael Janssen ; Wu Jiang ; Alejandra Jimenez-Rosales ; Michael D. Johnson ; Svetlana Jorstad ; Taehyun Jung ; Mansour Karami ; Ramesh Karuppusamy ; Tomohisa Kawashima ; Garrett K. Keating ; Mark Kettenis ; Jae-Young Kim ; Junhan Kim ; Jongsoo Kim ; Motoki Kino ; Jun Yi Koay ; Patrick M. Koch ; Shoko Koyama ; Michael Kramer ; Carsten Kramer ; Thomas P. Krichbaum ; Cheng-Yu Kuo ; Tod R. Lauer ; Sang-Sung Lee ; Yan-Rong Li ; Zhiyuan Li ; Michael Lindqvist ; Rocco Lico ; Jun Liu ; Kuo Liu ; Elisabetta Liuzzo ; Wen-Ping Lo ; Andrei P. Lobanov ; Colin Lonsdale ; Ru-Sen Lu ; Jirong Mao ; Sera Markoff ; Daniel P. Marrone ; Alan P. Marscher ; Ivan Martí-Vidal ; Satoki Matsushita ; Yosuke Mizuno ; Izumi Mizuno ; James M. Moran ; Kotaro Moriyama ; Monika Moscibrodzka ; Cornelia Muller ; Gibwa Musoke ; Alejandro Mus Mejías ; Hiroshi Nagai ; Neil M. Nagar ; Ramesh Narayan ; Gopal Narayanan ; Iniyan Natarajan ; Roberto Neri ; Aristeidis Noutsos ; Hiroki Okino ; Hector Olivares ; Tomoaki Oyama ; Daniel C. M. Palumbo ; Jongho Park ; Nimesh Patel ; Ue-Li Pen ; Vincent Pietu ; Richard Plambeck ; Aleksandar PopStefanija ; Ben Prather ; Jorge A. Preciado-Lopez ; Venkatessh Ramakrishnan ; Ramprasad Rao ; Mark G. Rawlings ; Alexander W. Raymond ; Bart Ripperda ; Freek Roelofs ; Alan Rogers ; Eduardo Ros ; Mel Rose ; Arash Roshanineshat ; Helge Rottmann ; Alan L. Roy ; Chet Ruszczyk ; Benjamin R. Ryan ; Kazi L. J. Rygl ; Salvador Sanchez ; David Sanchez-Arguelles ; Mahito Sasada ; Tuomas Savolainen ; F. Peter Schloerb ; Karl-Friedrich Schuster ; Lijing Shao ; Zhiqiang Shen ; Des Small ; Bong Won Sohn ; Jason SooHoo ; Fumie Tazaki ; Remo P. J. Tilanus ; Michael Titus ; Pablo Torne ; Tyler Trent ; Efthalia Traianou ; Sascha Trippe ; Ilse van Bemmel ; Huib Jan van Langevelde ; Daniel R. van Rossum ; Jan Wagner ; John Wardle ; Derek Ward-Thompson ; Jonathan Weintroub ; Norbert Wex ; Robert Wharton ; Maciek Wielgus ; George N. Wong ; Qingwen Wu ; Doosoo Yoon ; Andre Young ; Ken Young ; Ziri Younsi ; Feng Yuan ; Ye-Fei Yuan ; Shan-Shan Zhao ; EHT Collaboration ;
Date:	2 Oct 2020
Abstract:	The 2017 Event Horizon Telescope (EHT) observations of the central source in M87 have led to the first measurement of the size of a black-hole shadow. This observation offers a new and clean gravitational test of the black-hole metric in the strong-field regime. We show analytically that spacetimes that deviate from the Kerr metric but satisfy weak-field tests can lead to large deviations in the predicted black-hole shadows that are inconsistent with even the current EHT measurements. We use numerical calculations of regular, parametric, non-Kerr metrics to identify the common characteristic among these different parametrizations that control the predicted shadow size. We show that the shadow-size measurements place significant constraints on deviation parameters that control the second post-Newtonian and higher orders of each metric and are, therefore, inaccessible to weak-field tests. The new constraints are complementary to those imposed by observations of gravitational waves from stellar-mass sources.
Source:	arXiv, 2010.01055
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