Non-Gaussianities in New Ekpyrotic Cosmology
Non-Gaussianities in New Ekpyrotic Cosmology
The new ekpyrotic model is an alternative scenario of the early Universe which relies on a phase of slow contraction before the big bang. We calculate the 3-point and 4-point correlation functions of primordial density perturbations and find a generically large non-Gaussian signal, just below the current sensitivity level of …