Abstract: I outline the calculation of non-Gaussian mass density fluctuations that arise from one-loop Feynman diagrams in a de Sitter background. Their impact on the distribution of galaxies on very large length scales (i.e. l > 200/ h Mpc) is discussed. The role that symmetries of the de Sitter metric play in determining the form of the power spectrum, bi-spectrum and tri-spectrum of primordial curvature perturbations is emphasized.

Host: Fileviez Perez