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Thermal behavior of a radially deformed black hole spacetime

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arxiv 2102.04066 v2 pith:EJGKCU5T submitted 2021-02-08 gr-qc

Thermal behavior of a radially deformed black hole spacetime

classification gr-qc
keywords deformationeffectradialspacetimebehaviorgreybodyhawkingbounds
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In the present article, we study the Hawking effect and the bounds on greybody factor in a spacetime with radial deformation. This deformation is expected to carry the imprint of a non-Einsteinian theory of gravity, but shares some of the important characteristics of general relativity (GR). In particular, this radial deformation will restore the asymptotic behavior, and also allows for the separation of the scalar field equation in terms of the angular and radial coordinates -- making it suitable to study the Hawking effect and greybody factors. However, the radial deformation would introduce a change in the locations of the horizon, and therefore, the temperature of the Hawking effect naturally alters. In fact, we observe that the deformation parameter has an enhancing effect on both temperature and bounds on the greybody factor, which introduces a useful distinction with the Kerr spacetime. We discuss these effects elaborately, and broadly study the thermal behavior of a radially deformed spacetime.

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    Numerical simulations benchmark the eikonal and post-Kerr approximations for quasinormal modes in deformed Kerr spacetimes, quantifying their errors relative to expected observational precision.