Abstract
The condition for the existence of the superradiance modes is derived for the incident scalar, electromagnetic and gravitational waves when the spacetime background is a higher-dimensional rotating black hole with multiple angular momentum parameters. The final expression of the condition is 0<ω<∑imiΩi, where Ωi is an angular frequency of the black hole and, ω and mi are the energy of the incident wave and the ith azimuthal quantum number. The physical implication of this condition in the context of the brane-world scenarios is discussed.
Highlights
I miΩi, where Ωi is an angular frequency of the black hole and, ω and mi are the energy of the incident wave and the i-th azimuthal quantum number
Much attention is paid to the various properties of the absorption and emission problems in the higher-dimensional black holes
There is a controversy in the question of whether the higher-dimensional black holes radiate mainly on the brane or in the bulk
Summary
I miΩi, where Ωi is an angular frequency of the black hole and, ω and mi are the energy of the incident wave and the i-th azimuthal quantum number. For the non-rotating black holes the complete absorption and emission spectra are calculated numerically in Ref. The ratio of the low-energy absorption cross section for the Dirac fermion to that for the scalar field is derived analytically [9] in the charged black hole background.
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