Gravastar model in Randall-Sundrum braneworld

TL;DR

This paper develops a gravastar model within the Randall-Sundrum II braneworld framework, analyzing its structure and comparing it to classical and alternative gravity solutions, highlighting the effects of extra dimensions.

Contribution

It introduces a novel gravastar model in the Randall-Sundrum braneworld scenario and compares its properties with existing models in standard and alternative gravity theories.

Findings

Derived physical quantities for braneworld gravastars.

Compared braneworld gravastar solutions with classical Mazur-Mottola models.

Discussed the impact of extra dimensions on gravastar physics.

Abstract

In this work we derive a gravastar model in Randall-Sundrum II braneworld scenario. Gravastars (or gravitationally vacuum stars) were proposed by Mazur and Mottola as systems of gravitational collapse alternative to black holes. The external region of the gravastar is described by a Schwarzschild space-time, while its internal region is filled by dark energy. In between there is a thin shell surface with ultrarelativistic matter (sometimes referred to as stiff matter). We obtain solutions for some physical quantities of the braneworld gravastars. Those are compared to original Mazur-Mottola results as well as with some gravastar solutions in alternative gravity theories. The consequences of the braneworld setup in gravastar physics is deeply discussed.