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| Paper IPM / Astronomy / 16579 |
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| Abstract: | |
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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 ñ<0 and will be weakened with ñ>0. Moreover, by addressing the black hole bomb issue, we extract an improved bound in the instability regime indicating that ñ<0 increases the parameter space of the scalar field instability, while ñ>0 decreases it.
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