WMAP constraints on low redshift evolution of dark energy
Astrophysics
2007-05-23 v2 General Relativity and Quantum Cosmology
High Energy Physics - Theory
Abstract
The conceptual difficulties associated with a cosmological constant have led to the investigation of alternative models in which the equation of state parameter, , of the dark energy evolves with time. We show that combining the supernova type Ia observations {\it with the constraints from WMAP observations} restricts large variation of at low redshifts. The combination of these two observational constraints is stronger than either one. The results are completely consistent with the cosmological constant as the source of dark energy.
Cite
@article{arxiv.astro-ph/0404378,
title = {WMAP constraints on low redshift evolution of dark energy},
author = {H. K. Jassal and J. S. Bagla and T. Padmanabhan},
journal= {arXiv preprint arXiv:astro-ph/0404378},
year = {2007}
}
Comments
Final version to appear in MNRAS (Letters); discussion enlarged and clarifications and references added; 6 pages; 3 figures