PIRSA:26040078

The Discrete Geometries of Schwinger-Keldysh and Correlation Functions

Frost, H. (2026). The Discrete Geometries of Schwinger-Keldysh and Correlation Functions. Perimeter Institute. https://pirsa.org/26040078

Frost, Hadleigh. The Discrete Geometries of Schwinger-Keldysh and Correlation Functions. Perimeter Institute, Apr. 02, 2026, https://pirsa.org/26040078 

          @misc{ pirsa_PIRSA:26040078,
            doi = {10.48660/26040078},
            url = {https://pirsa.org/26040078},
            author = {Frost, Hadleigh},
            keywords = {Mathematical physics},
            language = {en},
            title = {The Discrete Geometries of Schwinger-Keldysh and Correlation Functions},
            publisher = {Perimeter Institute},
            year = {2026},
            month = {apr},
            note = {PIRSA:26040078 see, \url{https://pirsa.org}}
          }

Hadleigh Frost University of Oxford

Talk numberPIRSA:26040078
DOI10.48660/26040078
Collection
Talk Type Scientific Series
Subject

Abstract

Cosmological correlation functions probe the origins of structure in the universe. We view them as a prototype for time-dependent correlators and finite-temperature correlators in QFT. I will share recent work on the simple discrete geometries and spacetime pictures that control these correlators at tree-level, give a single origin of the range of polytopes previously studied in connection with cosmological correlators, and recast the Born rule as one expansion among many. Based on 2602.21194 and ongoing work. N.B. A math version of this talk will be given on the same day in the Waterloo combinatorics seminar, and people may wish to "pick their flavor" of talk.