Improved ISW effect detection through the CMB polarization assistence
Liu, Guo Chin (Department of physics, Tamkang University)

Integrated Sachs-Wolfe (ISW) effect can be estimated by cross-correlating the cosmic microwave background (CMB) sky with tracers of the local matter distribution. At late cosmic time, the dark energy induced decay of gravitation potential generates a cross-correlation signal on large angular scales. The dominant noise of this detection are the intrinsic CMB anisotropies from the inflationary epoch. The CMB polarization can be used to reduce the noise. Applying the idea to WMAP 7-year data and NVSS radio source catalog, we find the ISW detection is improved by about 10%.