Bounded excursion stable gravastars and black holes

Abstract

Dynamical models of prototype gravastars were constructed in order to study their stability. The models are the Visser-Wiltshire three-layer gravastars, in which an infinitely thin spherical shell of stiff fluid divides the whole spacetime into two regions, where the internal region is de Sitter, and the external is Schwarzschild. It is found that in some cases the models represent the "bounded excursion" stable gravastars, in which the thin shell is oscillating between two finite radii, while in other cases they collapse until the formation of black holes. In the phase space, the region for the ``bounded excursion" gravastars is very small in comparison to that of black holes, but not empty. Therefore, although the existence of gravastars cannot be excluded from such dynamical models, our results do indicate that, even if gravastars indeed exist, they do not exclude the existence of black holes.

Revtex4, 12 figures. Version published in JCAP, 06 (2008) 025

References in corpus (13)

• Dynamics of dark energy
• Non-equilibrium Thermodynamics of Spacetime
• Thermodynamic route to Field equations in Lanczos-Lovelock Gravity
• Friedmann Equations and Thermodynamics of Apparent Horizons
• Gravastars supported by nonlinear electrodynamics
• Where are all the gravastars? Limits upon the gravastar model from accreting black holes
• Van der Waals quintessence stars
• First law of thermodynamics and Friedmann-like equations in braneworld cosmology
• Non-existence of self-similar solutions containing a black hole in a universe with a stiff fluid or scalar field or quintessence
• Self-similar cosmological solutions with dark energy. I: formulation and asymptotic analysis
• Existence of black holes in Friedmann-Robertson-Walker universe dominated by dark energy
• N-spheres in general relativity: regular black holes without apparent horizons, static wormholes with event horizons and gravastars with a tube-like core
• Gravitational collapse due to dark matter and dark energy in the brane world scenario

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