The authors build an anisotropic gravastar model whose pressure profile and cut-off make it interpolate between a Hayward regular black hole and a horizonless ultracompact star, then compute shadow images for two accretion disk models.
Electrically charged gravastar configurations
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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.
fields
gr-qc 1years
2024 1verdicts
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Anisotropic gravastar as horizonless regular black hole spacetime and its images illuminated by thin accretion disk
The authors build an anisotropic gravastar model whose pressure profile and cut-off make it interpolate between a Hayward regular black hole and a horizonless ultracompact star, then compute shadow images for two accretion disk models.