https://doi.org/10.1140/epjc/s10052-021-09816-z
Regular Article - Theoretical Physics
Testing Kerr black hole mimickers with quasi-periodic oscillations from GRO J1655-40
1
Center for Theoretical Physics, College of Physics, Sichuan University, 610064, Chengdu, China
2
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, CB3 0WA, Cambridge, UK
Received:
4
August
2021
Accepted:
6
November
2021
Published online:
27
November
2021
The measurements of quasi-periodic oscillations (QPOs) provide a quite powerful tool to test the nature of astrophysical black hole candidates in the strong gravitational field regime. In this paper, we use QPOs within the relativistic precession model to test a recently proposed family of rotating black hole mimickers, which reduce to the Kerr metric in a limiting case, and can represent traversable wormholes or regular black holes with one or two horizons, depending on the values of the parameters. In particular, assuming that the compact object of GRO J1655-40 is described by a rotating black hole mimicker, we perform a 
-square analysis to fit the parameters of the mimicker with two sets of observed QPO frequencies from GRO J1655-40. Our results indicate that although the metric around the compact object of GRO J1655-40 is consistent with the Kerr metric, a regular black hole with one horizon is favored by the observation data of GRO J1655-40.
© The Author(s) 2021. corrected publication 2022
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