Some remarks on the observational constraints on the self-interacting scalar field model for dark energy

Details Some remarks on the observational constraints on the self-interacting scalar field model for dark energy Some remarks on the observational constraints on the self-interacting scalar field model for dark energy

2009-10-25

arxiv.org/abs/0910.4736v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Latex file, 12 pages, 12 figures in eps format

Scientific paper

The dark energy component of the cosmic budget is represented by a self-interacting scalar field. The violation of the null energy condition is allowed. Hence, such component can also represent a phantom fluid. The model is tested using supernova type Ia and matter power spectrum data. The supernova test leads to preferred values for configurations representing the phantom fluid. The matter power spectrum constraints for the dark energy equation of state parameter are highly degenerated. In both cases, values for the equation of state parameter corresponding to the phantom fluid are highly admitted if no particular prior is used.

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