Regular Seminar Guilherme Leite Pimentel (University of Amsterdam)
In flat space, four point scattering amplitudes at weak coupling can be fully determined from Lorentz symmetry, unitarity and causality. The resulting scattering amplitude depends on model details only through coupling constants and the particle content of the theory. I will show how the analogous story works in the case of inflationary fluctuations. We found explicit expressions for inflationary three and four-point functions, whose shapes depend on the field content of the theory, and do not depend on the specific inflationary model, as long as the fluctuations minimally break de Sitter symmetry. This ``cosmological bootstrap” is a first step towards classifying all possible shapes of primordial non-gaussianity, which can be searched for in experimental data.
2019-03-29 - 2019-03-30 at University of Oxford
Registration is free to all. Moreover, thanks to a new grant from the IOP, we have additional money to pay for the housing for any students who wish to come. However, we can only guarantee support to students who register this week, so please do sign up asap.