Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/10/035
Keywords
inflation; non-gaussianity; physics of the early universe
Funding
- STFC [ST/M001202/1] Funding Source: UKRI
- Science and Technology Facilities Council [1359392] Funding Source: researchfish
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We develop a formalism for calculating soft limits of n-point inflationary correlation functions using separate universe techniques. Our method naturally allows for multiple fields and leads to an elegant diagrammatic approach. As an application we focus on the trispectrum produced by inflation with multiple light fields, giving explicit formulae for all possible single- and double-soft limits. We also investigate consistency relations and present an in finite tower of inequalities between soft correlation functions which generalise the Suyama-Yamaguchi inequality.
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