Stability properties of some perfect fluid cosmological models

Details Stability properties of some perfect fluid cosmological models Stability properties of some perfect fluid cosmological models

2005-04-26

arxiv.org/abs/astro-ph/0504576v2

Phys.Rev. D72 (2005) 103518

Astronomy and Astrophysics

Astrophysics

Discussion about the inclusion of radition into the model is enlarged and results of numerical calculations are presented. Fin

Scientific paper

10.1103/PhysRevD.72.103518

Flat FRW perfect fluid cosmologies can be reproduced as particular solutions of suitable field theoretical models. Here we investigate the stability of perfect fluid model trajectories with respect to sets of trajectories of the corresponding field models having generic initial conditions. It is shown that the trajectories of barotropic perfect fluid models and those of the Chaplygin gas model are stable. The total probability to reach the Chaplygin gas regime early enough to achieve a matter dominated stage having a realistic duration is calculated for a scalar field model assuming a natural measure in the space of initial conditions taken near a cosmological singularity. An example is presented of a two-fluid cosmological model where the stability is partially absent.

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