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Paper   IPM / Astronomy / 16579
School of Astronomy
  Title:   Black hole superradiance in the presence of Lorentz symmetry violation
  Author(s):  Mohsen . Khodadi
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  103
  Year:  2021
  Supported by:            ipm IPM
In this paper we consider the massive scalar perturbation on the top of a small spinning-like black hole in context of Einstein-bumblebee modified gravity in order to probe the role of spontaneous Lorentz symmetry breaking on the superradiance scattering and corresponding instability. We show that at the low-frequency limit of the scalar wave the superradiance scattering will be enhanced with the Lorentz-violating parameter α<0 and will be weakened with α>0. Moreover, by addressing the black hole bomb issue, we extract an improved bound in the instability regime indicating that α<0 increases the parameter space of the scalar field instability, while α>0 decreases it.

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