Soft Theorems For Shift-Symmetric Cosmologies
Abstract
We derive soft theorems for single-clock cosmologies that enjoy a shift symmetry. These so-called consistency conditions arise from a combination of a large diffeomorphism and the internal shift-symmetry and fix the squeezed limit of all correlators with a soft scalar mode. As an application, we show that our results reproduce the squeezed bispectrum for Ultra-slow-roll inflation, a particular shift-symmetric, non-attractor model which is known to violate Maldacena's consistency relation. Similar results have been previously obtained by Mooij and Palma using background-wave methods. Our results shed new light on the infrared structure of single-clock cosmological spacetimes.
Keywords
Cite
@article{arxiv.1711.03737,
title = {Soft Theorems For Shift-Symmetric Cosmologies},
author = {Bernardo Finelli and Garrett Goon and Enrico Pajer and Luca Santoni},
journal= {arXiv preprint arXiv:1711.03737},
year = {2018}
}
Comments
4 pages, v2: citation added, v3: citations added and edited in accordance with published version