Sommaire:

Information about the Universe is encoded in the large scale structure, which can be extracted using statistical tools. In particular, the three-point correlation function (bispectrum) of the matter overdensity provides complementary information to its two-point counterpart (power spectrum). In the first part of the talk, I will present my results on the large-scale matter bispectrum using perturbative methods up to three loops, showing the scales up to which they are valid by comparing to numerical simulations and I will describe phenomenological techniques to model the bispectrum on smaller scales. In the second part of the talk, I will explain how, by adding the bias and RSDs, the galaxy bispectrum can be used to tighten constraints on the amplitude of primordial non-Gaussianity with respect to the CMB values from Planck.

Pour plus d'informations, merci de contacter Lavalle J.