The Sachs-Wolfe effect

Comparison of the Sachs-Wolfe effect for Gaussian and non-Gaussian fluctuations.

A consequence of non-Gaussian perturbations on the Sachs-Wolfe effect is studied. For a particular power spectrum, predicted Sachs-Wolfe effects are calculated for two cases: Gaussian (random phase) configuration, and a specific kind of non-Gaussian configuration. We obtain a result that the Sachs-Wolfe effect for the latter case is smaller when each temperature fluctuation is properly normaliz...

The integrated Sachs-Wolfe effect and the SKA

An important probe of dark energy is the integrated Sachs-Wolfe effect, where cosmic microwave background anisotropies are generated at late times once the dark energy becomes important dynamically. This contribution briefly describes the effect and summarises the present observational evidence for it. A potential survey by the Square Kilometre Array (SKA) covering a large fraction of the sky c...

Sachs-Wolfe effect in some anisotropic models

In this work it is shown that there are some spatially homogeneous but anisotropic models (Kantowski-Sachs and Bianchi type-III), with a positive cosmological constant, for which the inhomogeneities in the distribution of matter on the surface of the last scattering produce anisotropies (in large angular scales θ ∼ > 10 ◦) that do not differ from the ones produced in Friedmann-Lemâıtre-Robertso...

ADetection of the Integrated Sachs-Wolfe Effect

We have detected statistically significant correlations between the cosmic microwave background and two tracers of large-scale structure, the HEAO1 A2 full sky hard X-ray map (Boldt, 1987) and the NVSS 1.4 GHz, nearly full sky radio galaxy survey (Condon et al., 1998). The level of correlations in these maps is consistent with that predicted for the integrated Sachs-Wolfe (ISW) effect in the co...

Combined analysis of the integrated Sachs-Wolfe effect and cosmological implications

Statistics of rare objects and the Integrated Sachs-Wolfe effect in ΛCDM N-body simulations