Regular Article - Theoretical Physics
Study of parametrized dark energy models with a general non-canonical scalar field
Department of Physics, Visva-Bharati, Santiniketan, 731235, India
* e-mail: firstname.lastname@example.org
Accepted: 24 February 2016
Published online: 11 March 2016
In this paper, we consider various dark energy models in the framework of a non-canonical scalar field with a Lagrangian density of the form , which provides the standard canonical scalar field model for and . In this particular non-canonical scalar field model, we carry out the analysis for . We then obtain cosmological solutions for constant as well as variable equation of state parameter () for dark energy. We also perform the data analysis for three different functional forms of by using the combination of SN Ia, BAO, and CMB datasets. We have found that for all the choices of , the SN Ia CMB/BAO dataset favors the past decelerated and recent accelerated expansion phase of the universe. Furthermore, using the combined dataset, we have observed that the reconstructed results of and q(z) are almost choice independent and the resulting cosmological scenarios are in good agreement with the CDM model (within the confidence contour). We have also derived the form of the potentials for each model and the resulting potentials are found to be a quartic potential for constant and a polynomial in for variable .
© The Author(s), 2016