2008/07/31 by Dubravko Horvat, Saša Ilijić, Sasa Ilijic +2
Biochemistry, Genetics and Molecular Biology · Engineering · Physics and Astronomy · #Fluid dynamics and aerodynamics studies #Geomagnetism and Paleomagnetism Studies #Solar and Space Plasma Dynamics #gr-qc
paper · pdf · doi:10.1088/0264-9381/26/2/025003
published as Class.Quant.Grav.26:025003,2009 · LaTeX, 14 pages, 3 figs, changes wrt v1: discussion of emergent equation of state included and references updated (to appear in CQG)
arxiv created 2008/12/02 · openalex publication_date 2008/12/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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.