Parameter estimation of the Bardeen-Kerr black hole in cloud of strings using shadow analysis

Abstract

We consider the rotating generalization of the Bardeen black hole solution in the presence of cloud of strings (CoS). The parameter space for which the black hole horizon exists is determined. We also study the static limit surface and the ergo-region in the presence of the CoS parameter. We consider photon orbits and obtain the deformation of black hole shadows due to rotation for various values of the CoS parameter. The shadow deformation is used to determine the black hole spin for different values of the black hole parameters.

Photon orbits and phase transition for Letelier AdS black holes immersed in perfect fluid dark matter*

“…The criticality and thermal phase transition behavior was explored in the string cloud background in the presence of an additional field [38]. Another study was also devoted to the shadow analysis for the Letelier spacetime [39,40], whereas the others were studied in another contexts [41][42][43][44][45][46][47][48][49][50][51][52][53]. The Letelier spacetime in a spherically symmetric case is obtained with a gauge invariant model of an array of a cloud of strings coupled to gravity in the framework of Einstein's general relativity.…”