Linear dark energy equation of state revealed by supernovae?
Cosmology and Nongalactic Astrophysics
2014-12-18 v3
Abstract
In this letter we propose a test to detect the linearity of the dark energy equation of state, and apply it to two different Type Ia Supernova (SN Ia) data sets, Union2.1 and SNLS3. We find that: a. current SN Ia data are well described by a dark energy equation of state linear in the cosmic scale factor a, at least up to a redshift z = 1, independent of the pivot points chosen for the linear relation; b. there is no significant evidence of any deviation from linearity. This apparent linearity may reflect the limit of dark energy information extractable from current SN Ia data.
Keywords
Cite
@article{arxiv.1211.1012,
title = {Linear dark energy equation of state revealed by supernovae?},
author = {Vincenzo Salzano and Yun Wang and Irene Sendra and Ruth Lazkoz},
journal= {arXiv preprint arXiv:1211.1012},
year = {2014}
}
Comments
revtex4-1, 7 pages, 2 figures, 3 tables, submitted