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, Menglei Zhou

arXiv5/1/2020·DOI·Read paper

Abstract

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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