Radiating Gravastars

Abstract

Considering a Vaidya exterior spacetime, we study dynamical models of prototype gravastars, made of an infinitely thin spherical shell of a perfect fluid with the equation of state $p=\sigma$, enclosing an interior de Sitter spacetime. We show explicitly that the final output can be a black hole, an unstable gravastar, a stable gravastar or a "bounded excursion" gravastar, depending on how the mass of the shell evolves in time, the cosmological constant and the initial position of the dynamical shell. This work presents, for the first time in the literature, a gravastar that emits radiation.

23 pages and 17 figures, some typos corrected. Accepted for publication in JCAP

References in corpus (6)

• Dynamics of dark energy
• How to tell a gravastar from a black hole
• Regular black holes and black universes
• Gravastars supported by nonlinear electrodynamics
• Stable and "bounded excursion" gravastars, and black holes in Einstein's theory of gravity
• Gravastars and Black Holes of Anisotropic Dark Energy

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• Stable Charged Gravastar model in Cylindrically Symmetric Space-time
• Stable Gravastars: Guilfoyle's electrically charged solutions
• Stability analysis of Lower Dimensional Gravastars in noncommutative geometry
• Gravastar in the framework of Loop Quantum Cosmology