| Texto completo | |
| Autor(es): |
Campos, M.
;
Lima, J. A. S.
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW D; v. 86, n. 4, p. 9-pg., 2012-08-24. |
| Resumo | |
We discuss the gravitational collapse of a spherically symmetric massive core of a star in which the fluid component is interacting with a growing vacuum energy density. The influence of the variable vacuum in the collapsing core is quantified by a phenomenological beta parameter as predicted by dimensional arguments and the renormalization group approach. For all reasonable values of this free parameter, we find that the vacuum energy density increases the collapsing time, but it cannot prevent the formation of a singular point. However, the nature of the singularity depends on the value of beta. In the radiation case, a trapped surface is formed for beta <= 1/2, whereas for beta >= 1/2, a naked singularity is developed. In general, the critical value is beta = 1-2/3(1 + omega) where omega is the parameter describing the equation of state of the fluid component. (AU) | |
| Processo FAPESP: | 04/13668-0 - Cosmologia na era da precisão: energia escura, matéria escura e radiação cósmica de fundo |
| Beneficiário: | Jose Ademir Sales de Lima |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |