Speaker
Description
The study of n-point correlators of primordial perturbations usually reveals new features of the inflationary or alternative to inflation epochs of the early Universe and offers a promising window into the perturbative regime of quantum gravity. It is therefore important to develop new methods for computing correlation functions. In this work, we apply the cosmological bootstrap approach to compute the bispectrum of scalar perturbations in a model of a Bounce Universe built within the framework of Horndeski gravity. The important property of the latter is that this model is conformally related to an inflation model. We show that bootstrap rules remain valid for this particular Bounce Universe scenario. We compare our results for three scalar bispectrum with those obtained previously using conventional in-in technique. Then we evaluate the bispectrum for the mixed sector (two gravitons and one scalar, one graviton and two scalars) and for three gravitons in this scenario for the first time.
