| Texto completo | |
| Autor(es): |
Mello, Marina M. C.
;
Maciel, Alan
;
Zanchin, Vilson T.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW D; v. 95, n. 8, p. 23-pg., 2017-04-19. |
| Resumo | |
A class of nonstationary spacetimes is obtained by means of a conformal transformation of the Schwarzschild metric, where the conformal factor a(t) is an arbitrary function of the time coordinate only. We investigate several situations including some where the final state is a central object with constant mass. The metric is such that there is an initial big-bang type singularity and the final state depends on the chosen conformal factor. The Misner-Sharp mass is computed and a localized central object may be identified. The trapping horizons, geodesic and causal structure of the resulting spacetimes are investigated in detail. When a(t) asymptotes to a constant in a short enough time scale, the spacetime presents an event horizon and its analytical extension reveals black-hole or white-hole regions. On the other hand, when a(t) is unbounded from above as in cosmological models, the spacetime presents no event horizons and may present null singularities in the future. The energy-momentum content and other properties of the respective spacetimes are also investigated. (AU) | |
| Processo FAPESP: | 11/18729-1 - Gravitação e cosmologia: questões estruturais e aplicações |
| Beneficiário: | Elcio Abdalla |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |