Shapes of rotating nonsingular black hole shadows

Muhammed Amir; Sushant G. Ghosh

doi:10.1103/PhysRevD.94.024054

paper

Shapes of rotating nonsingular black hole shadows

arXiv:1603.06382 · doi:10.1103/PhysRevD.94.024054

Abstract

It is believed that curvature singularities are a creation of general relativity and hence, in the absence of a quantum gravity, models of nonsingular black holes have received significant attention. We study the shadow (apparent shape), an optical appearance because of its strong gravitational field, cast by a nonsingular black hole which is characterized by three parameters, i.e., mass ( $M$ ), spin ( $a$ ), and a deviation parameter ( $k$ ). The nonsingular black hole under consideration, is a generalization of the Kerr black hole {that} can be recognized asymptotically ( $r >> k, k > 0$ ) explicitly as the Kerr-Newman black hole, and in the limit $k \to 0$ as the Kerr black hole. It turns out that the shadow of a nonsingular black hole is a dark zone covered by {a} deformed circle. Interestingly, it is seen that the shadow of a black hole is affected due to the parameter $k$ . Indeed, for a given $a$ , the size of a shadow reduces as the parameter $k$ increases and the shadow becomes more distorted as we increase the value of the parameter $k$ when compared with the analogous Kerr black hole shadow. We also investigate, in detail, how the ergoregion of a black hole is changed due to the deviation parameter $k$ .

11 pages, 11 figures, Published version

Shapes of rotating nonsingular black hole shadows

Abstract

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