Radiating Gravastars

Details Radiating Gravastars Radiating Gravastars

2011-09-09

arxiv.org/abs/1109.2062v2

JCAP 10 (2011) 13

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

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

Scientific paper

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.

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