Gravastars and black holes of anisotropic dark energy |
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Authors: | Email author" target="_blank">R?ChanEmail author M?F?A?da?Silva P?Rocha |
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Institution: | 1.Coordena??o de Astronomia e Astrofísica,Observatório Nacional,Rio de Janeiro,Brazil;2.Departamento de Física Teórica, Instituto de Física,Universidade do Estado do Rio de Janeiro,Rio de Janeiro,Brazil;3.Gerência de Tecnologia da Informa??o, ACERP, TV Brasil,Rádios Nacional e MEC,Rio de Janeiro,Brazil;4.IST - Instituto Superior de Tecnologia de Paracambi,FAETEC, Rua Sebasti?o de Lacerda,Paracambi,Brazil |
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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 − γ)σ 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 (ω = −1). |
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Keywords: | |
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