2018/10/31 by Sumarna Haroon, Mubasher Jamil, Kimet Jusufi +2 · 3 citations
Physics and Astronomy · #Angular diameter #Angular momentum #Astrophysics #Black Holes and Theoretical Physics #Black hole (networking) #Classical mechanics #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark fluid #Dark matter #Einstein #Extremal black hole #Gauss–Bonnet theorem #Lambda #Lambda-CDM model #Mathematical physics #Perfect fluid #Physics #Quantum mechanics #Relativity and Gravitational Theory #Rotating black hole #gr-qc
paper · pdf · doi:10.1103/physrevd.99.044015
published as Phys. Rev. D 99, 044015 (2019) · 15 pages, 4 figures. Accepted for publication in Physical Review D
openalex created_date 2018/10/26 · arxiv created 2019/01/31 · openalex publication_date 2019/02/11 · arxiv updated 2019/02/12 · openalex updated_date 2026/08/05
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, along with its extension to nonzero cosmological constant \mathrm\ensuremathΛ. Working in Boyer-Lindquist coordinates, we consider the effects of the perfect dark matter fluid parameter \ensuremathα on the shadow cast by a black hole with respect to an observer at position (ro,\ensuremathθo). 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 \ensuremathα and \mathrm\ensuremathΛ.