Large scale structure and ISW effect in decaying vacuum cosmology

Abstract

The concordance particle creation model - a class of $Λ(t)$CDM cosmologies - is studied using large scale structure (LSS) formation, with particular attention to the integrated Sachs-Wolfe (ISW) effect. The evolution of the gravitational potential and the amplitude of the cross-correlation of the cosmic microwave background (CMB) signal with LSS surveys are calculated in detail. We properly include in our analysis the peculiarities involving the baryonic dynamics of the $Λ(t)$CDM model which were not included in previous works. Although both the $Λ(t)$CDM and the standard cosmology are in agreement with available data for the CMB-LSS correlation, the former presents a slightly higher signal which can be identified with future data.

5 pages, 4 figures