Non-Gaussianities: Probing High Energy Physics with Cosmological Observations
Institute for Advanced Study
Observational cosmology has made tremendous progress in the last few years, allowing us to begin to understand what occurred in the very first few moments of the history of our Universe and how the astrophysical structures that we see around us developed. So far, all current cosmological observations can be explained by assuming that the primordial density perturbations are of quantum origin and follow a Gaussian probability distribution, as predicted by the simplest class of inflationary models. As observations keep improving, we might soon be led to discover that their distribution is actually non-Gaussian. I will explain how this non-Gaussianity could be detected, its theoretical motivation, and most importantly the large amount of information it would reveal us about the Physics of the very early Universe and of the very high energies.