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Next-to-leading order corrections to scalar perturbations of Kerr-anti-de Sitter black holes
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Next-to-leading order corrections to scalar perturbations of Kerr-anti-de Sitter black holes
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The small Kerr-anti-de Sitter black hole demonstrates instability due to the superradiance of either a massive or massless scalar field. Previous leading-order approximations of the spectrum are inefficient. In particular, the leading-order real part of the eigenfrequency is insensitive to the spin of the black hole. In this work, we improve the analysis by including the next-to-leading-order contribution. Compared to the numerical calculation, the new spin-dependent real part presents significantly better agreement, and the error in the imaginary part is also reduced to less than 60% for most black hole spins.
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