PIRSA:08060172 Conference Quantum Fields and Strings Particle Physics Cosmology

DOI10.48660/08060172

Conference/School: PASCOS 08

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}}
}

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.

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