Shadow and deflection angle of rotating black holes in perfect fluid dark matter with a cosmological constant

Abstract

The presence of dark matter around a black hole remarkably affects its spacetime. We consider the effects of dark matter on the shadow of a new solution to the Einstein equations that describes a rotating black hole in the background of perfect dark matter fluid (PFDM), along with its extension to nonzero cosmological constant $\Lambda$. Working in Boyer-Lindquist coordinates, we consider the effects of the PFDM parameter $\alpha$ on the shadow cast by a black hole with respect to an observer at position $(r_o,\theta_o)$. By applying the Gauss-Bonnet theorem to the optical geometry we find that notable distortions from a Kerr black hole can occur. We describe their dependence on $\alpha$ and $\Lambda$.

Locations

• Physical review. D/Physical review. D. - View
• arXiv (Cornell University) - View - PDF
• DataCite API - View