Electrically charged gravastar configurations
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.
Cite
@article{arxiv.0807.2051,
title = {Electrically charged gravastar configurations},
author = {Dubravko Horvat and Sasa Ilijic and Anja Marunovic},
journal= {arXiv preprint arXiv:0807.2051},
year = {2009}
}
Comments
LaTeX, 14 pages, 3 figs, changes wrt v1: discussion of emergent equation of state included and references updated (to appear in CQG)