Physics NotePublished
Inhomogeneous two-fluid cosmologies
J. A. S. Lima; J. Tiomno
1987
Publication details
- Authors
- J. A. S. Lima; J. Tiomno
- Type
- Physics Note
- Status
- Published
- Publication date
- 1987
- Description
- 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.
- Year
- 1987
- Number
- CBPF-NF-032/87
- Linked to a thesis
- No
- Linked to a grant
- No