2005/04/30 by Pier-Stefano Corasaniti, P. S. Corasaniti, T. Giannantonio +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.1103/physrevd.71.123521
published as Phys.Rev. D71 (2005) 123521 · 7 pages, 7 figures, extended discussion on baryon density and covariance matrix, matches PRD accepted version
arxiv created 2005/06/01 · openalex publication_date 2005/06/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the possibility of constraining dark energy with the integrated Sachs-Wolfe effect recently detected by cross-correlating the Wilkinson Microwave Anisotropy Probe maps with several large scale structure surveys. In agreement with previous works, we found that, under the assumption of a flat universe, the integrated Sachs-Wolfe 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 ce2. For quintessencelike dark energy (ce2=1) we find w<\ensuremath-0.53, while tighter bounds are possible only if the dark energy is ``clustered'' (ce2=0), in such a case \ensuremath-1.94<w<\ensuremath-0.63 at 2\ensuremathσ. Better measurements of the cosmic microwave background-large scale structure correlation will be possible with the next generation of deep redshift surveys. This will provide independent constraints on the dark energy which are alternative to those usually inferred from cosmic microwave background and SN-Ia data.