Charged Gravastar in a Dark Energy Universe

C. F. C. Brandt, R. Chan, M. F. A. da Silva, P. Rocha

Coordena??o de Astronomia e Astrofisica, Observatório Nacional, Rua General José Cristino, 77, S?o Cristóv?o, Rio de Janeiro, RJ, Brazil.
Departamento de Fisica Teórica, Instituto de Fsica, Universidade do Estado do Rio de Janeiro, Rua S?o Francisco Xavier 524, Maracan?, Rio de Janeiro-RJ, Brazil.
Departamento de Fisica Teórica, Instituto de Fsica, Universidade do Estado do Rio de Janeiro, Rua S?o Francisco Xavier 524, Maracan?, Rio de Janeiro-RJ, Brazil;IST-Instituto Superior de Tecnologia de Paracambi, FAETEC, Rua Sebasti?o de Lacerda s/n, Bairro da Fábrica, Paracambi, RJ, Brazil.

DOI: 10.4236/jmp.2013.46118                

Abstract

Here we constructed a charged gravastar model formed by an interior de Sitter spacetime, a charged dynamical infinitely thin shell with an equation of state and an exterior de Sitter-Reissner-Nordstrom spacetime. We find that the presence of the charge is crucial to the stability of these structures. It can as much favor the stability of a bounded excursion gravastar, and still converting it in a stable gravastar, as make disappear a stable gravastar, depending on the range of the charge considered. There is also formation of black holes and, above certain values, the presence of the charge allows the formation of naked singularity. This is an important example in which a naked singularity emerges as a consequence of unstabilities of a gravastar model, which reinforces that gravastar is not an alternative model to black hole.

Keywords

Gravastar; Charge; De Sitter-Reissner-Nordstrom Spacetime; Black Hole; Naked Singularity; Dark Energy

Conflicts of Interest

The authors declare no conflicts of interest.

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