Mimicking alternatives to inflation with interacting spectator fields

Understand

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.