Constraining dark energy with cross-correlated CMB and Large Scale Structure data

Details Constraining dark energy with cross-correlated CMB and Large Scale Structure data Constraining dark energy with cross-correlated CMB and Large Scale Structure data

2005-04-05

arxiv.org/abs/astro-ph/0504115v2

Phys.Rev. D71 (2005) 123521

Astronomy and Astrophysics

Astrophysics

7 pages, 7 figures, extended discussion on baryon density and covariance matrix, matches PRD accepted version

Scientific paper

10.1103/PhysRevD.71.123521

We investigate the possibility of constraining dark energy with the Integrated Sachs Wolfe effect recently detected by cross-correlating the WMAP maps with several Large Scale Structure surveys. In agreement with previous works, we found that, under the assumption of a flat universe, the ISW signal is a promising tool for constraining dark energy. Current available data put weak limits on a constant dark energy equation of state w. We also find no constraints on the dark energy sound speed c_e^2. For quintessence-like dark energy (c_e^2=1) we find w<-0.53, while tighter bounds are possible only if the dark energy is ``clustered'' (c_e^2=0), in such a case -1.94

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