Determining scalar field potential in power-law cosmology with observational data
Abstract
In power-law cosmology, we determine potential function of a canonical scalar field in FLRW universe in presence of barotropic perfect fluid. The combined WMAP5+BAO+SN dataset and WMAP5 dataset are used here to determine the value of the potential. The datasets suggest slightly closed universe. If the universe is closed, the exponents of the power-law cosmology are (WMAP5 dataset) and (combined dataset). The lower limits of (closed geometry) are for WMAP5 dataset and for the combined dataset. The domination of the power-law term over the curvature and barotropic density terms is characterised by the inflection of the potential curve. This happens when the universe is 5.3 Gyr old for both datasets.
Keywords
Cite
@article{arxiv.0904.2743,
title = {Determining scalar field potential in power-law cosmology with observational data},
author = {Kiattisak Thepsuriya and Burin Gumjudpai},
journal= {arXiv preprint arXiv:0904.2743},
year = {2011}
}
Comments
5 pages, 2 figures, talk given at the 4th Siam GR+HEP+Cosmo Symposium at Naresuan University, Phitsanulok, Thailand 28 July 2009. Minor correction in introduction section and ref. added