Detection of the ISW effect and corresponding dark energy constraints
Astrophysics
2009-11-11 v1
Abstract
Using a directional spherical wavelet analysis we detect the integrated Sachs-Wolfe (ISW) effect, indicated by a positive correlation between the Wilkinson Microwave Anisotropy Probe (WMAP) and NRAO VLA Sky Survey (NVSS) data, at the 3.9 sigma level. In a flat universe the detection of the ISW effect provides direct and independent evidence for dark energy. Moreover, we use our detection to constrain the dark energy density Omega_Lambda. We obtain estimates for Omega_Lambda consistent with other analysis techniques and data sets and rule out a zero cosmological constant at greater than 99% significance.
Cite
@article{arxiv.astro-ph/0605122,
title = {Detection of the ISW effect and corresponding dark energy constraints},
author = {J. D. McEwen and P. Vielva and M. P. Hobson and E. Martinez-Gonzalez and A. N. Lasenby},
journal= {arXiv preprint arXiv:astro-ph/0605122},
year = {2009}
}
Comments
4 pages, 3 figures, Proceedings of XLIst Rencontres de Moriond