Gravastars with an Interior Dark Energy Fluid Forming a Naked Singularity

Details Gravastars with an Interior Dark Energy Fluid Forming a Naked Singularity Gravastars with an Interior Dark Energy Fluid Forming a Naked Singularity

2010-12-06

arxiv.org/abs/1012.1233v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

24 pages and 16 figures. It was made substantial modifications compared to previous version

Scientific paper

We consider a gravastar model made of anisotropic dark energy with an infinitely thin spherical shell of a perfect fluid with the equation of state $p = (1-\gamma)\sigma$ with an external de Sitter-Schwarzschild region. It is found that in some cases the models represent the "bounded excursion" stable gravastars, where the thin shell is oscillating between two finite radii, while in other cases they collapse until the formation of black holes or naked singularities. An interesting result is that we can have black hole and stable gravastar formation even with an interior and a shell cons tituted of dark and repulsive dark energy, as also shown in previous work. Besides, in one case we have a dynamical evolution to a black hole (for $\Lambda =0$) or to a naked singularity (for $\Lambda > 0$). This is the first time in the literature that a naked singularity emerges from a gravastar model.

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