2010/12/06 by C. F. C. Brandt, R. Chan, Brandt, C. F. C. +6 · 1 citation
Mathematics · Physics and Astronomy · #Astrophysics #Astrophysics and Star Formation Studies #Cosmology #Cosmology and Gravitation Theories #Dark energy #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geometry #Mathematics #Naked singularity #Physics #Singularity #Stellar, planetary, and galactic studies #gr-qc
paper · pdf · doi:10.48550/arxiv.1012.1233
published in arXiv (Cornell University) (Cornell University) · 24 pages and 16 figures. It was made substantial modifications compared to previous version
openalex publication_date 2010/12/06 · arxiv created 2011/12/21 · arxiv updated 2015/03/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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-γ)σ 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 Λ=0) or to a naked singularity (for Λ> 0). This is the first time in the literature that a naked singularity emerges from a gravastar model.