Constraints on black-hole charges with the 2017 EHT observations of M87∗
Journal article, 2021

Our understanding of strong gravity near supermassive compact objects has recently improved thanks to the measurements made by the Event Horizon Telescope (EHT). We use here the M87∗ shadow size to infer constraints on the physical charges of a large variety of nonrotating or rotating black holes. For example, we show that the quality of the measurements is already sufficient to rule out that M87∗ is a highly charged dilaton black hole. Similarly, when considering black holes with two physical and independent charges, we are able to exclude considerable regions of the space of parameters for the doubly-charged dilaton and the Sen black holes.


Prashant Kocherlakota

Goethe University Frankfurt

Luciano Rezzolla

Goethe University Frankfurt

Trinity College Dublin

Heino Falcke

Radboud University

Christian M. Fromm

Harvard University

Goethe University Frankfurt

Harvard-Smithsonian Center for Astrophysics

John Conway

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Michael Lindqvist

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Physical Review D

2470-0010 (ISSN) 2470-0029 (eISSN)

Vol. 103 10 104047

Subject Categories

Subatomic Physics

Astronomy, Astrophysics and Cosmology



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