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.
Original language | English |
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Article number | 008 |
Journal | Journal of Cosmology and Astroparticle Physics |
Volume | 2018 |
Issue number | 2 |
DOIs | |
State | Published - 6 Feb 2018 |
Keywords
- cosmological perturbation theory
- inflation
- quantum field theory on curved space