PIRSA:08060172

Stochastic Inflation and Replica Field Theory

Kuhnel, F. (2008). Stochastic Inflation and Replica Field Theory. Perimeter Institute. https://pirsa.org/08060172

Kuhnel, Florian. Stochastic Inflation and Replica Field Theory. Perimeter Institute, Jun. 06, 2008, https://pirsa.org/08060172 

          @misc{ pirsa_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},
            year = {2008},
            month = {jun},
            note = {PIRSA:08060172 see, \url{https://pirsa.org}}
          }

Florian Kuhnel Nordita - Nordic Institute for Theoretical Physics

DOI 10.48660/08060172
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.