The Shah-Vaidya charged cosmological black hole metric is shown to be an exact solution of Einstein-Maxwell equations with a cuscuton field, and its causal structure is classified into four parameter regions with different horizon counts and naked singularities.
Hence, considering that the isotropic coordinate is real, the domain of the areal radius coordi- nateR should be restricted to the intervalsR+≤R< ∞ and 0≤R≤R−
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Charged cosmological black holes: a thorough study of a family of solutions
The Shah-Vaidya charged cosmological black hole metric is shown to be an exact solution of Einstein-Maxwell equations with a cuscuton field, and its causal structure is classified into four parameter regions with different horizon counts and naked singularities.