Electrically charged gravastar configurations

TL;DR

This paper explores electrically charged gravastar models, solving Einstein-Maxwell equations for interior solutions and analyzing their physical properties, including stability and redshift, with both thin shell and continuous profile approaches.

Contribution

It introduces charged gravastar configurations with exact solutions, extending previous uncharged models by incorporating electric charge and analyzing their physical characteristics.

Findings

Two viable charged gravastar models satisfying energy conditions.

Electric charge influences the stability and surface redshift of the models.

Interior solutions smoothly match Reissner-Nordstrom exterior geometry.

Abstract

The notion of a compact object immune to the horizon problem and comprising an anisotropic inhomogeneous fluid with a specific radial pressure behavior, i.e. the gravastar, is extended by introducing an electrically charged component. Einstein-Maxwell field equations are solved in the asymptotically de Sitter interior where a source of the electric field is coupled to the fluid energy density. Two different solutions which satisfy the dominant energy condition are given: one is the delta-shell model for which the analysis is carried out within Israel's thin shell formalism, the other approach - the continuous profile model - is solved numerically and the interior solutions have been (smoothly) joined with the Reissner-Nordstrom exterior. The effect of electric charge is considered, and the equation of state, the speed of sound and the surface redshift are calculated for both models.