https://doi.org/10.1140/epjc/s10052-024-13179-6
Regular Article – Theoretical Physics
Constraining a disformal Schwarzschild black hole in DHOST theories with the orbit of the S2 star
1
Department of Physics, Institute of Interdisciplinary Studies, Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education, Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, 410081, Changsha, Hunan, People’s Republic of China
2
Center for Gravitation and Cosmology, College of Physical Science and Technology, Yangzhou University, 225009, Yangzhou, People’s Republic of China
Received:
15
April
2024
Accepted:
30
July
2024
Published online:
18
August
2024
With the observed data of the S2 orbit around the black hole Sgr A
and the Markov Chain Monte Carlo method, we make a constraint on parameters of a disformal Schwarzschild black hole in quadratic degenerate higher-order scalar-tensor (DHOST) theories. This black hole belongs to a class of non-stealth solutions and owns an extra disformal parameter described the deviation from general relativity. Our results show that the best fit value of the disformal parameter is positive. However, in the range of 
, we also find that general relativity remains to be consistent with the observation of the S2 orbit.
© The Author(s) 2024
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