paper

Kerr-Anti-De-Sitter/De-Sitter Black Hole In Perfect Fluid Dark Matter Background

arXiv:1711.04538 · doi:10.1088/1361-6382/aabcb6

Abstract

We obtain the Kerr-anti-de-sitter (Kerr-AdS) and Kerr-de-sitter (Kerr-dS) black hole (BH) solutions to the Einstein field equation in the perfect fluid dark matter background using the Newman-Janis method and Mathematica package. We discuss in detail the black hole properties and obtain the following main results: (i) From the horizon equation , we derive the relation between the perfect fluid dark matter parameter and the cosmological constant when the cosmological horizon exists. For , we find that is in the range for and for . For positive cosmological constant (Kerr-AdS BH), decreases if , and increases if . For negative cosmological constant (Kerr-dS BH), increases if and decreases if ; (ii) An ergosphere exists between the event horizon and the outer static limit surface. The size of the ergosphere evolves oppositely for and , while decreasing with the increasing . When there is sufficient dark matter around the black hole, the black hole spacetime changes remarkably; (iii) The singularity of these black holes is the same as that of rotational black holes. In addition, we study the geodesic motion using the Hamilton-Jacobi formalism and find that when is in the above ranges for , stable orbits exist. Furthermore, the rotational velocity of the black hole in the equatorial plane has different behaviour for different and the black hole spin . It is asymptotically flat and independent of if while is asymptotically flat only when is close to zero if .

22 pages, 4 figures

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