PIRSA:26030065

Video URL

https://pirsa.org/26030065

Cutting rule on cosmological correlators and its applications

Ema, Y. (2026). Cutting rule on cosmological correlators and its applications. Perimeter Institute for Theoretical Physics. https://pirsa.org/26030065

Ema, Yohei. Cutting rule on cosmological correlators and its applications. Perimeter Institute for Theoretical Physics, Mar. 17, 2026, https://pirsa.org/26030065 

          @misc{ scivideos_PIRSA:26030065,
            doi = {10.48660/26030065},
            url = {https://pirsa.org/26030065},
            author = {Ema, Yohei},
            keywords = {Particle Physics},
            language = {en},
            title = {Cutting rule on cosmological correlators and its applications},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2026},
            month = {mar},
            note = {PIRSA:26030065 see, \url{https://scivideos.org/pirsa/26030065}}
          }

Yohei Ema University of Minnesota

Talk numberPIRSA:26030065
DOI10.48660/26030065
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

We derive a cutting rule for equal-time in-in correlators, including cosmological correlators based on Keldysh r/a basis, which decomposes diagrams into fully retarded functions and cut-propagators consisting of Wightman functions. Our derivation relies only on basic assumptions such as unitarity, locality, and the causal structure of the in-in formalism. We apply the cutting rule to simplify the extraction of non-local cosmological collider signals, and prove the absence of one-loop scale-invariant corrections from enhanced small-scale perturbations to superhorizon curvature and tensor perturbations.