Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2021/10/003
Keywords
astrophysical black holes; GR black holes; gravity; X-ray binaries
Funding
- National Natural Science Foundation of China [11991053, 11721303, 11975027]
- Young Elite Scientists Sponsorship Program by the China Association for Science and Technology [2018QNRC001]
- National SKA Program of China [2020SKA0120300]
- Max Planck Partner Group Program - Max Planck Society
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The study tests the no-hair theorem using quasi-periodic oscillations in the relativistic precession model, applying the Kerr-Q and Hartle-Thorne metrics to derive expressions for quasi-periodic frequencies. A degeneracy in constraining spin and quadrupole parameters complicates the measurement of their values. By proposing a novel test using the Hartle-Thorne metric, it is found that there is strong evidence suggesting the Kerr black hole as the source of the central object in GRO J1655-40.
We perform an observational test of no-hair theorem using quasi-periodic oscillations within the relativistic precession model. Two well motivated metrics we apply are Kerr-Q and Hartle-Thorne metrics in which the quadrupole is the parameter that possibly encodes deviations from the Kerr black hole. The expressions for the quasi-periodic frequencies are derived before comparing the models with the observation. We encounter a degeneracy in constraining spin and quadrupole parameters that makes it difficult to measure their values. In particular, we here propose a novel test of no-hair theorem by adapting the Hartle-Thorne metric. We complement our study by doing a model comparison. We find that there is strong evidence that Kerr black hole is the source of the central object in GRO J1655-40 given the present observational precisions.
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