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

Universidade Federal do Espírito Santo, Departamento de Física - Av. Fernando Ferrari, 514, Campus de Goiabeiras, CEP 29075-910, Vitória, Espírito Santo, Brazil

Corresponding authors: fabris@pq.cnpq.br dfjardim@gmail.com

Received: 27 October 2009
Accepted: 4 March 2010

Abstract

We consider a cosmological model containing a dust fluid and self-interacting scalar field, with an exponential potential, the first component representing dark matter and the second dark energy. The model is tested against supernova type-Ia (Constitution and Gold sample) and the 2dFGRS matter power spectrum data. The results are crossed with the recent seven-year WMAP estimations for the dark-energy equation-of-state parameter α using CMB, BAO and H(z). The final results indicate, at 1σ level, α = when the Constitution sample is used, and α = when the Gold sample is employed. The implications for a dark-energy component composed of phantom field is discussed.