Gravastars and Black Holes of Anisotropic Dark Energy

Abstract

Dynamical models of prototype gravastars made of anisotropic dark energy are constructed, in which an infinitely thin spherical shell of a perfect fluid with the equation of state $p=(1-\gamma )\sigma$ divides the whole spacetime into two regions, the internal region filled with a dark energy fluid, and the external Schwarzschild region. The models represent "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. Here we show, for the first time in the literature, a model of gravastar and formation of black hole with both interior and thin shell constituted exclusively of dark energy. Besides, the sign of the parameter of anisotropy ($p_t-p_r$) seems to be relevant to the gravastar formation. The formation is favored when the tangential pressure is greater than the radial pressure, at least in the neighborhood of the isotropic case ($\omega =-1$).

arXiv comment16 pages, 8 figures. Accepted for publication in Gen. Rel. Grav

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Cited by in corpus (14)

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• Stable Bounded Excursion Gravastars with Regular Black Holes
• Anisotropic charged dark energy star
• Charged strange star coupled to anisotropic dark energy in Tolman-Kuchowicz spacetime
• Radiating Gravastars
• Charged Gravastar in a Dark Energy Universe
• Nonsingular black holes from conformal symmetries
• Horizonless star based on regular black hole with finite radius and its observational signatures
• Dynamical Evolution of an Unstable Gravastar with Zero Mass
• Kiselev Black Holes in Anti-de Sitter Spacetime Are Not Viable
• Effective models of non-singular quantum black holes