Background cosmological dynamics in gravity and observational constraints
Jan, 2010
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Abstract: (arXiv)
In this paper, we carry out a study of viable cosmological models in -gravity at the background level. For this, we formed an autonomous system of equations involving observable parameters like and .With this we study the cosmological evolution. The models exhibit two different regimes in their time evolution, namely, a phantom phase followed by a quintessence like behavior. We employ statefinder parameters to emphasize a characteristic discriminative signature of these models. We also fit the models with latest SnIa and BAO data. Our study shows that in general there is no significant constraint on model parameters from background cosmological observations.- 04.50.Kd
- 04.25.Nx
- 04.50.-h
- background
- cosmological model
- quintessence
- gravitation: f(R)
- supernova
- phantom
- dark matter
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