Deflection of light by a rotating black hole surrounded by quintessence

Prateek Sharma, Hemwati Nandan, RADOUANE GANNOUJI, Rashmi Uniyal, Amare Abebe

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We present a detailed analysis of a rotating black hole surrounded by quintessence. This solution represents a fluid with a constant equation of state, w, which can for example describe an effective warm dark matter fluid around a black hole. We clarify the conditions for the existence of such a solution and study its structure by analyzing the existence of horizons as well as the extremal case. We show that the deflection angle produced by the black hole depends on the parameters (c,w) which need to obey the condition cw < 0 because of the weak energy condition, where c is an additional parameter describing the hair of the black hole. In this context, we found that for w 0.1 (consistent with warm dark matter) and c < 0, the deviation angle is larger than that in the Kerr space-time for direct and retrograde orbits. We also derive an exact solution in the case of w = -1/3.

Original languageEnglish
Article number2050155
JournalInternational Journal of Modern Physics A
Volume35
Issue number26
DOIs
StatePublished - 20 Sep 2020
Externally publishedYes

Keywords

  • Black holes
  • dark energy
  • gravitational lensing
  • quintessence

Fingerprint Dive into the research topics of 'Deflection of light by a rotating black hole surrounded by quintessence'. Together they form a unique fingerprint.

Cite this