The integrated sachs-wolfe effect and the rees-sciama effect

Abstract

It has been around fifty years since R. K. Sachs and A. M. Wolfe predicted the existence of anisotropy in the cosmic microwave background (CMB) and ten years since the integrated Sachs-Wolfe effect (ISW) was first detected observationally. The ISW effect provides us with a unique probe of the accelerating expansion of the Universe. The cross-correlation between the largescale structure and CMB is the most promising way to extract the ISW effect from the data. In this article, we review the physics of the ISW effect and summarize recent observational results and interpretations.