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Ergosphere and shadow of a rotating regular black hole | | Sushant G. Ghosh
; Muhammed Amir
; Sunil D. Maharaj
; | | Date: |
13 Jun 2020 | | Abstract: | The spacetime singularities in classical general relativity predicted by the
celebrated singularity theorems are formed at the end of gravitational
collapse. Quantum gravity is the expected theory to resolve the singularity
problem, but we are now far from it. Therefore attention has shifted to models
of regular black holes free from the singularities. A spherically symmetric
regular toy model was obtained by Dymnikova (1992) which we demonstrate as an
exact solution of Einstein’s field equations coupled to nonlinear
electrodynamics for a Lagrangian with parameter $b$ related to magnetic charge.
We construct rotating counterpart of this solution which encompasses the Kerr
black hole as a special case when charge is switched off ($b=0$). Event Horizon
Telescope has released the first image of supermassive black hole M87$^*$,
revealing the structure near black hole horizon. The rotating regular black
hole’s shadow may be useful to determine strong field regime. We investigate
ergosphere and black hole shadow of rotating regular black hole to infer that
their sizes are sensitive to charge $b$ and have a richer chaotic structure. In
particular, rotating regular black hole possess larger size, but less distorted
shadows when compared with Kerr black holes. We find one to one correspondence
between ergosphere and shadow of the black hole. | | Source: | arXiv, 2006.7570 | | Services: | Forum | Review | PDF | Favorites | |
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