Charged gravastars admitting conformal motion

TL;DR

This paper introduces a charged gravastar model with conformal motion, extending the Mazur-Mottola framework by incorporating charge and analyzing the resulting electromagnetic mass and stability features.

Contribution

It presents a novel charged gravastar model with conformal symmetry, linking gravitational mass to electromagnetic effects within a modified Mazur-Mottola framework.

Findings

Total gravitational mass vanishes with zero charge

Interior de Sitter vacuum acts as an electromagnetic mass model

Analyzed stress-energy tensor and entropy of the system

Abstract

We propose a new model of a {\it gravastar} admitting conformal motion. While retaining the framework of the Mazur-Mottola model, the gravastar is assumed to be internally charged, with an exterior defined by a Reissner-Nordstr{\"o}m rather than a Schwarzschild line element. The solutions obtained involve (i) the interior region, (ii) the shell, and (iii) the exterior region of the sphere. Of these three cases the first case is of primary interest since the total gravitational mass vanishes for vanishing charge and turns the total gravitational mass into an {\it electromagnetic mass} under certain conditions. This suggests that the interior de Sitter vacuum of a charged gravastar is essentially an electromagnetic mass model that must generate the gravitational mass. We have also analyzed various other aspects such as the stress energy tensor in the thin shell and the entropy of the system.