Mimicking features in alternatives to inflation with interacting spectator fields

Abstract

It has been argued that oscillatory features from spectator fields in the primordial power spectrum could be a probe of alternatives to inflation. In this work, we soften this claim by showing that the frequency and amplitude dependence of the patterns appearing in these scenarios could be mimicked by field interactions during inflation. The degeneracy of the frequency holds for the n -point correlation functions, while the degeneracy of the amplitude is broken at the level of non-gaussianities.

Guillem Domènech

Researcher in gravity and cosmology

I am an Emmy Noether Research Group Leader at the Insitute for Theoretical Physics at the Leibniz University Hannover. My research focuses in various aspects of cosmology, gravity and particle physics.