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- W4220961024 abstract "In this paper we pursue the study of linear perturbations around a Schwarzschild black hole in a generalized Einstein-Cartan theory of gravity, called torsion bigravity. This theory contains both massless and massive spin-2 excitations. Here we consider non spherically-symmetric perturbations with generic multipolarity $L geq 1$. We extend the conclusion of linear stability, previously obtained for $L=0$ [Phys. Rev. D 104, 024032], to the generic $L geq 1$ case. We prove that the mass $kappa$ of the massive spin-2 excitation must be large enough, namely $kappa r_h > sqrt{1+eta}$, to avoid the presence of singularities in the perturbation equations. The perturbation equations are shown to have a triangular structure, where massive spin-2 excitations satisfy decoupled equations, while the Einstein-like massless spin-2 ones satisfy inhomogeneous equations sourced by the massive spin-2 sector. We study quasi-bound states, and exhibit some explicit complex quasi-bound frequencies. We briefly discuss the issue of superradiance instabilities." @default.
- W4220961024 created "2022-04-03" @default.
- W4220961024 creator A5083174281 @default.
- W4220961024 date "2022-03-29" @default.
- W4220961024 modified "2023-10-18" @default.
- W4220961024 title "Perturbations of a Schwarzschild black hole in torsion bigravity" @default.
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- W4220961024 doi "https://doi.org/10.1103/physrevd.105.064060" @default.
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