Shadow cast by rotating braneworld black holes with a cosmological constant

TL;DR

This paper investigates how rotating braneworld black holes with a cosmological constant cast shadows, analyzing their shapes and observables to understand potential astrophysical signatures and the influence of extra-dimensional effects.

Contribution

It provides a detailed analysis of black hole shadows in a braneworld scenario with a cosmological constant, including shape, observables, and observational prospects, which is novel in this context.

Findings

The shape of the shadow varies with tidal charge and rotation.

The cosmological constant influences the shadow's apparent size and shape.

Observational signatures could help distinguish braneworld black holes from standard ones.

Abstract

In this article, we study the shadow produced by rotating black holes with a tidal charge in a Randall-Sundrum braneworld model, with a cosmological constant. We obtain the apparent shape and the corresponding observables for different values of the tidal charge and the rotation parameter, and we analyze the influence of the presence of the cosmological constant. We also discuss the observational prospects for this optical effect.