Cosmological Dressing Rules
High Energy Physics - Theory
2026-03-12 v2 General Relativity and Quantum Cosmology
Abstract
The basic observables in cosmology are known as in-in correlators. Recent calculations have revealed that in-in correlators in four dimensional de Sitter space exhibit hidden simplicity stemming from a close relation to scattering amplitudes in flat space. In this paper we explain how to make this property manifest by dressing flat space Feynman diagrams with certain auxiliary propagators. These dressing rules are derived for conformally coupled and massless scalar theories and we show that they reproduce the same infrared divergences predicted by the Schwinger-Keldysh formalism.
Cite
@article{arxiv.2503.10598,
title = {Cosmological Dressing Rules},
author = {Chandramouli Chowdhury and Arthur Lipstein and Joe Marshall and Jiajie Mei and Ivo Sachs},
journal= {arXiv preprint arXiv:2503.10598},
year = {2026}
}
Comments
38 pages + appendices, v2: added references, v3: published version