Rotating black hole mimicker surrounded by the string cloud

TL;DR

This paper derives a rotating black hole mimicker surrounded by a string cloud, capable of representing both regular black holes and traversable wormholes, and studies how spin and string cloud parameters affect observable properties.

Contribution

It introduces a new rotating black hole mimicker model with a string cloud that interpolates between black holes and wormholes, analyzing its observable features.

Findings

Shadow size increases with string cloud parameter L

Shadow distortion is affected by spin a

Energy emission rate varies with L and a

Abstract

Traversable wormholes and regular black holes usually represent completely different scenarios. But in the black bounce spacetime they can be described by a same line element, which is very attractive. Furthermore, the black hole photos taken by EHT show that black holes have spin, so spin is an indispensable intrinsic property of black holes in the actual universe. In this work, we derive a rotating black hole mimicker surrounded by the string cloud (SC), which can be interpolated to represent regular black hole spacetime and traversable wormhole spacetime. We investigate the effect of the spin $a$ and SC parameter $L$ on the observables (shadow radius $R_s$ and distortion $\delta_s$) and energy emission rate of the black hole mimicker surrounded by the SC. We find that shadow for this spacetime is very sensitive to the $L$, i.e., the SC parameter can significantly increase the boundary of the shadow.