On Soft Limits of Inflationary Correlation Functions

Details On Soft Limits of Inflationary Correlation Functions On Soft Limits of Inflationary Correlation Functions

2012-04-18

arxiv.org/abs/1204.4207v1

Physics

High Energy Physics

High Energy Physics - Theory

26 pages, 5 figures

Scientific paper

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.

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