Nota de FísicaPublicado
Inhomogeneous two-fluid cosmologies
J. A. S. Lima; J. Tiomno
1987
Dados da publicação
- Autores
- J. A. S. Lima; J. Tiomno
- Tipo
- Nota de Física
- Status
- Publicado
- Data de publicação
- 1987
- Descrição
- A new class of expanding cosmological solutions is derived. The matter content of these models is a mixture of two interac ting simple fluids: the first one, homogeneous and isotropic with equation of state <math>\operatorname{p=(y-1)\rho}</math> the dynamics of which is given by the FRW equation and the second one an inhomogenous dust. The limiting case of two dusts corresponds to the Szekeres' universes;of class II. A large subclass of the models evolve to a FRW phase for all physically meaningful values of the poly tropic index <math>\gamma</math> and the curvature parameter <math>\operatorname{k}</math>. A gauge condition. under which the metric is invariant is shown to exist for <math>k\neq 0</math>. In particular it explains why the parabolic model is a pe- culiar solution in the class found by Szekeres.
- Ano
- 1987
- Número
- CBPF-NF-032/87
- Vínculo com tese
- Não
- Vínculo com bolsa
- Não