For a rotating hairy black hole, thin-disk flux, temperature, luminosity, and ray-traced images deviate increasingly from Kerr as spin grows, especially in the inner disk.
On the temperature of hairy black holes
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The gravitational decoupling method represents an extremely useful tool to obtain new solutions of the Einstein equations through minimal geometrical deformations. In this paper, we consider the hairy charged black hole obtained by the gravitational decoupling and calculate their Hawking temperature in order to compare it with the case when the hairs are ignored. We have found out that the hairs, under some conditions of black hole parameters, affect the Hawking temperature and can increase it. We have also found out that the black hole temperature, in hairy case, doesn't depend on the electric charge.
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Thin Accretion Disk Around Rotating Hairy Black Hole: Radiative Property and Optical Appearance
For a rotating hairy black hole, thin-disk flux, temperature, luminosity, and ray-traced images deviate increasingly from Kerr as spin grows, especially in the inner disk.