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arXiv · 1707.08282

Consistency relations in multi-field inflation

Jinn-Ouk Gong·Min-Seok Seo
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Abstract

We study the consequences of spatial coordinate transformation in multi-field inflation. Among the spontaneously broken de Sitter isometries, only dilatation in the comoving gauge preserves the form of the metric and thus results in quantum-protected Slavnov-Taylor identities. We derive the corresponding consistency relations between correlation functions of cosmological perturbations in two different ways, by the connected and one-particle-irreducible Green's functions. The lowest-order consistency relations are explicitly given, and we find that even in multi-field inflation the consistency relations in the soft limit are independent of the detail of the matter sector.

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Jinn-Ouk Gong, Min-Seok Seo. 2017-07-26. Consistency relations in multi-field inflation. https://doi.org/10.1088/1475-7516%2F2018%2F02%2F008

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