On soft limits of inflationary correlation functions
Journal
Journal of Cosmology and Astroparticle Physics
Journal Volume
2012
Journal Issue
11
Date Issued
2012-11-01
Author(s)
Abstract
Soft limits of inflationary correlation functions are both observationally relevant and theoretically robust. Various theorems can be proven about them that are insensitive to detailed model-building assumptions. In this paper, we re-derive several of these theorems in a universal way. Our method makes manifest why soft limits are such an interesting probe of the spectrum of additional light fields during inflation. We illustrate these abstract results with a detailed case study of the soft limits of quasi-single-field inflation. © 2012 IOP Publishing Ltd and Sissa Medialab srl.
Subjects
inflation | non-gaussianity
Type
journal article