How the Cosmological Constant Affects Gravastar Formation

Details How the Cosmological Constant Affects Gravastar Formation How the Cosmological Constant Affects Gravastar Formation

2009-10-11

arxiv.org/abs/0910.2054v2

JCAP 0912:017,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

36 pages and 23 figures, correcting some typos and clarifying some points, accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2009/12/017

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.

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