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PIRSA:08060172

Video URL

https://pirsa.org/08060172

Stochastic Inflation and Replica Field Theory

          @misc{ scivideos_PIRSA:08060172,
            doi = {10.48660/08060172},
            url = {https://pirsa.org/08060172},
            author = {Kuhnel, Florian},
            keywords = {Quantum Fields and Strings, Particle Physics, Cosmology},
            language = {en},
            title = {Stochastic Inflation and Replica Field Theory},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2008},
            month = {jun},
            note = {PIRSA:08060172 see, \url{https://scivideos.org/pirsa/08060172}}
          }

Florian Kuhnel Nordic Institute for Theoretical Physics

Talk numberPIRSA:08060172
DOI10.48660/08060172
Source RepositoryPIRSA
Collection
Talk Type Conference
Subject

Abstract

We formulate a general replica field-theoretic framework for stochastic inflation in which a manifestation of dimensional reduction is found. The scale above which the latter becomes dominant is explicitly calculated. It is found that for a wide class of stochastic systems considerable changes of the spectral index inevitably occur on super-horizon scales. We work out an explicit relation between the noise correlator and the non-Gaussianity parameter $f_{NL}$, which thus can effectively be generated entirely by quantum fluctuations.