Testing No-Hair Theorem by Quasi-Periodic Oscillations: the quadrupole of GRO J1655$-$40

Autor:	Allahyari, Alireza, Shao, Lijing
Rok vydání:	2021
Předmět:	General Relativity and Quantum Cosmology Astrophysics - Cosmology and Nongalactic Astrophysics Astrophysics - High Energy Astrophysical Phenomena
Zdroj:	JCAP10(2021)003
Druh dokumentu:	Working Paper
DOI:	10.1088/1475-7516/2021/10/003
Popis:	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. It turns out that a Kerr black hole is a good description of the central object in GRO J1655$-$40 given the present observational precisions. Comment: 20 pages, 8 figures, 1 table, improved version, accepted for publication in JCAP
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2102.02232 Zobrazit plný text záznamu View this record from Arxiv