How the Cosmological Constant Affects Gravastar Formation
Abstract
Here we generalized a previous model of gravastar consisted of an internal de Sitter spacetime, a dynamical infinitely thin shell with an equation of state, but now we consider an external de Sitter-Schwarzschild spacetime. We have shown explicitly that the final output can be a black hole, a "bounded excursion" stable gravastar, a stable gravastar, or a de Sitter spacetime, depending on the total mass of the system, the cosmological constants, the equation of state of the thin shell and the initial position of the dynamical shell. We have found that the exterior cosmological constant imposes a limit to the gravastar formation, i.e., the exterior cosmological constant must be smaller than the interior cosmological constant. Besides, we have also shown that, in the particular case where the Schwarzschild mass vanishes, no stable gravastar can be formed, but we still have formation of black hole.
Keywords
Cite
@article{arxiv.0910.2054,
title = {How the Cosmological Constant Affects Gravastar Formation},
author = {R. Chan and M. F. A. da Silva and P. Rocha},
journal= {arXiv preprint arXiv:0910.2054},
year = {2012}
}
Comments
36 pages and 23 figures, correcting some typos and clarifying some points, accepted for publication in JCAP