Psaltis, Dimitrios;
Medeiros, Lia;
Christian, Pierre;
Ozel, Feryal;
Akiyama, Kazunori;
Alberdi, Antxon;
Alef, Walter;
... Zhao, Shan-Shan; + view all
(2020)
Gravitational Test beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole.
Physical Review Letters
, 125
(14)
, Article 141104. 10.1103/PhysRevLett.125.141104.
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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.
| Type: | Article |
|---|---|
| Title: | Gravitational Test beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.125.141104 |
| Publisher version: | http://dx.doi.org/10.1103/physrevlett.125.141104 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Physical Sciences, Physics, Physics, Multidisciplinary, Science & Technology |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10187210 |
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