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Superradiance of rotating cohomogeneity-1 black holes: Scalar case
14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
Year (definitive publication)
2018
Language
English
Country
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Abstract
Greybody factors of rotating cohomogeneity-1 black holes in higher odd dimensions are studied for the cases in which the cosmological constant is zero, positive, or negative. Attention is given to the main superradiant modes. It is shown that the increase of the intensity of the cosmological constant can have diverse effects on the maximum amplification obtained. In the case of de Sitter (dS) black holes, maximum amplification is enhanced for higher values of the cosmological constant. In the case of Anti-de Sitter (AdS) black holes, the increase of the absolute value of the cosmological constant has the effect of suppressing the maximum amplification initially, but eventually this behavior reverses and we observe growth. This phenomenon can be interpreted as contributions from amplification peaks of distinct origin that become dominant in different regimes.
Acknowledgements
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Keywords
Black holes,greybody factors,superradiance,cosmological constant
Fields of Science and Technology Classification
- Physical Sciences - Natural Sciences
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