Shadow of higher dimensional collapsing dark star and blackhole

TL;DR

This paper analytically and numerically investigates the shadow profiles of higher-dimensional collapsing dark stars and black holes, exploring how extra spatial dimensions influence observable shadow features.

Contribution

It provides the first analytical calculation of shadows for higher-dimensional collapsing stars using a generalized Vaidya metric and compares these with numerical results.

Findings

Higher dimensions alter the shadow size and shape.

Shadows of higher-dimensional objects can be distinguished from four-dimensional cases.

The study offers potential observational signatures of extra dimensions.

Abstract

The shadow of a black hole or a collapsing star is of great importance as we can extract important properties of the object and of the surrounding spacetime from the shadow profile. It can also be used to distinguish different types of black holes and ultra compact objects. In this work, we have analytically calculated the shadow of a higher dimensional collapsing dark star, described by higher dimensional Vaidya metric, by choosing a slightly generalized version of Misner--Sharp mass function. We have also numerically investigated the properties of the shadows of the black holes and the collapsing stars for a slightly more general mass function. Examining the potential influence of extra spatial dimensions on the shadow, we have explored the possibility of distinguishing higher dimensions from the standard four-dimensional spacetime.