X-ray reflection spectroscopy with Kaluza-Klein black holes

Ashutosh Tripathi; Askar B. Abdikamalov; Cosimo Bambi; Dimitry Ayzenberg; Jiachen Zhu; Menglei Zhou; Mubasher Jamil; Mustapha Azreg-Ainou; Sourabh Nampalliwar

X-ray reflection spectroscopy with Kaluza-Klein black holes

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arxiv 2005.00184 v2 pith:YQPH7BTA submitted 2020-05-01 gr-qc

X-ray reflection spectroscopy with Kaluza-Klein black holes

Jiachen Zhu , Askar B. Abdikamalov , Dimitry Ayzenberg , Mustapha Azreg-Ainou , Cosimo Bambi , Mubasher Jamil , Sourabh Nampalliwar , Ashutosh Tripathi

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Menglei Zhou

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Kaluza-Klein theory is a popular alternative theory of gravity, with both non-rotating and rotating black hole solutions known. This allows for the possibility that the theory could be observationally tested. We present a model which calculates the reflection spectrum of a black hole accretion disk system, where the black hole is described by a rotating solution of the Kaluza-Klein theory. We also use this model to analyze X-ray data from the stella-mass black hole in GRS 1915+105 and provide constraints on the free parameters of the Kaluza-Klein black holes.

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X-ray reflection data for EXO 1846–031 cannot distinguish the non-circular deformation parameter ℓ_NP from zero, remaining consistent with the Kerr hypothesis.