Lensing of the CMB: non-Gaussian aspects.
We compute the small angle limit of the three- and four-point function of the cosmic microwave background (CMB) temperature induced by the gravitational lensing effect by the large-scale structure of the universe. We relate the non-Gaussian aspects presented in this paper with those in our previous studies of the lensing effects. We interpret the statistics proposed in previous work in terms of different configurations of the four-point function and show how they relate to the statistic that maximizes the S/N.
Zaldarriaga
M
M
Institute for Advanced Study, School of Natural Sciences, Princeton, New Jersey 08540, USA. matiasz@physics.nyu.edu