Contribution to the ThreePoint Function of the Cosmic Microwave Background from the ReesSciama Effect
Abstract
We compute the contribution to the threepoint temperature correlation function of the cosmic microwave background coming from the nonlinear evolution of Gaussian initial perturbations, as described by the ReesSciama (or integrated SachsWolfe) effect. By expressing the collapsed threepoint function in terms of multipole amplitudes, we are able to calculate its expectation value for any power spectrum and for any experimental setting on large angular scales. We also give an analytical expression for the rms collapsed threepoint function arising from the cosmic variance of a Gaussian fluctuation field. In the case of COBE DMR, we find that the predicted signal is ∼3 orders of magnitude below that expected from the cosmic variance.
 Publication:

The Astrophysical Journal
 Pub Date:
 November 1995
 DOI:
 10.1086/176363
 arXiv:
 arXiv:astroph/9503115
 Bibcode:
 1995ApJ...453....1M
 Keywords:

 COSMOLOGY: COSMIC MICROWAVE BACKGROUND;
 GALAXIES: CLUSTERS: GENERAL;
 Astrophysics
 EPrint:
 uuencoded compressed postscript, 10 pages text, 2 pages figures