On Soft Limits of Inflationary Correlation Functions
High Energy Physics - Theory
2015-06-04 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
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.
Keywords
Cite
@article{arxiv.1204.4207,
title = {On Soft Limits of Inflationary Correlation Functions},
author = {Valentin Assassi and Daniel Baumann and Daniel Green},
journal= {arXiv preprint arXiv:1204.4207},
year = {2015}
}
Comments
26 pages, 5 figures; V2: references added + pedagogical improvements of Sec. 2 and App. A