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The Separate Universe Approach to Soft Limits

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If you have a question about this talk, please contact Tobias Baldauf.

In this talk I’ll calculate soft limits of n-point inflationary correlation functions using separate universe techniques. Our approach naturally allows for multiple fields and leads to an elegant diagrammatic approach. We apply this to the bispectrum and trispectrum, giving explicit formulae for all possible single- and double-soft limits. When compared to previous work on the bispectrum we find a 20% theoretical correction to observable parameters relevant for future cosmological experiments. We also investigate consistency relations and present an infinite tower of inequalities between soft correlation functions which generalise the Suyama-Yamaguchi inequality.

This talk is part of the Cosmology Lunch series.

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