The integrated Sachs-Wolfe effect in cross-correlation with galaxy samples - a reliable independent probe for constraining cosmology

摘要

Abstract, The -dominated Cold Dark Matter (CDM) model predicts the existence of asecondary anisotropy of the Cosmic Microwave Background (CMB), called Integrated Sachs-Wolfe(ISW) effect, due to the passing of CMB photons, after the radiation-matter decoupling, throughregions with time varying gravitational potential. Since the ISW effect is manifesting at large angularscales in the CMB anisotropies, where it is dominated by the primary CMB anisotropies and by thecosmic variance, has been proposed to measure the ISW effect of CMB from the cross-correlationwith local tracers of the gravitational potential from Large Scale Structure (LSS) observations. Weanalyze the ability of this probe to constrain the cosmological model, especially the dark energycomponent. We found an agreement between the constraint on the dark-energy density parameter, from CMB anisotropy-galaxy overdensity cross-correlation data, and that from CMB anisotropydata alone. Though the ISW effect gives a weaker determination of than CMB anisotropy data, itcan be used as an independent test for the dark energy.