Power law cosmology - a viable alternative

Abstract

A power law cosmology is defined by the cosmological scale factor evolving as $t^{\alpha }$. In this work, we put bounds on $\alpha$ by using the joint test of the SNe Ia data from Supernova Legacy Survey (SNLS) and H(z) data with curvature constant $k=0,\pm 1$. We observe that the combined analysis with SNLS and H(z) data favours the open power cosmology with $\alpha =1.31_{-0.05}^{+0.06}.ItisalsointerestingtonotethatanEinstein-deSittermodel$(α= 2/3)$isruledoutat$2σ$ level.

13 pages, 3 figures