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Cosmological Infrared Subtractions & Infrared-Safe Computables

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arxiv 2405.19979 v3 pith:FEPCKHN4 submitted 2024-05-30 hep-th gr-qcmath.CO

Paolo Benincasa , Francisco Vazão This is my paper · ORCID
classification hep-thgr-qcmath.CO
keywords cosmologicalinfrareddivergencesintegralsperturbationtheoryasymptoticchallenge
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Cosmological observables in perturbation theory turn out to be plagued with infrared divergences, which represents both a conceptual and computational challenge. In this paper we present a proof of concept for a systematic procedure to remove these divergences in a large class of scalar cosmological integrals and consistently define an infrared safe computable in perturbation theory. We provide diagrammatic rules which are based on the nestohedra underlying the asymptotic structure of such integrals.

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  1. Correlators are simpler than wavefunctions

    hep-th 2025-12 unverdicted novelty 6.0 of 10

    Equal-time correlators are simpler than wavefunctions because they come from full-spacetime integrals; this implies fewer poles, cleaner factorization, and a systematic pole expansion whose first subleading term vanishes.

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