Detection of the ISW effect and corresponding dark energy constraints
J. D. McEwen, P. Vielva, M. P. Hobson, E. Martinez-Gonzalez, A. N. Lasenby
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 OmegaLambda. We obtain estimates for OmegaLambda consistent with other analysis techniques and data sets and rule out a zero cosmological constant at greater than 99% significance.
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