The effect of reionization on the CMB-density correlation
Astrophysics
2008-11-26 v1
Abstract
In this paper we show how the rescattering of CMB photons after cosmic reionization can give a significant linear contribution to the temperature-matter cross-correlation measurements. These anisotropies, which arise via a late time Doppler effect, are on scales much larger than the typical scale of non-linear effects at reionization; they can contribute to degree scale cross-correlations and could affect the interpretation of similar correlations resulting from the integrated Sachs-Wolfe effect. While expected to be small at low redshifts, these correlations can be large given a probe of the density at high redshift, and so could be a useful probe of the cosmic reionization history.
Cite
@article{arxiv.0706.0274,
title = {The effect of reionization on the CMB-density correlation},
author = {Tommaso Giannantonio and Robert Crittenden},
journal= {arXiv preprint arXiv:0706.0274},
year = {2008}
}