PIRSA:08060163 Conference Quantum Fields and Strings Particle Physics Cosmology

DOI10.48660/08060163

Conference/School: PASCOS 08

Leblond, L. (2008). Limits from the Perturbative Regime of Inflation and Non-Gaussianity. Perimeter Institute. https://pirsa.org/08060163

Leblond, Louis. Limits from the Perturbative Regime of Inflation and Non-Gaussianity. Perimeter Institute, Jun. 05, 2008, https://pirsa.org/08060163 

@misc{ pirsa_PIRSA:08060163,
  doi = {10.48660/08060163},
  url = {https://pirsa.org/08060163},
  author = {Leblond, Louis},
  keywords = {Quantum Fields and Strings, Particle Physics, Cosmology},
  language = {en},
  title = {Limits from the Perturbative Regime of Inflation and Non-Gaussianity},
  publisher = {Perimeter Institute},
  year = {2008},
  month = {jun},
  note = {PIRSA:08060163 see, \url{https://pirsa.org}}
}

Abstract

The validity of the perturbative analysis during inflation imposes bounds on the inflationary parameters. For single field inflation, the current experimental bounds on non-Gaussianity necessarily imply that the physics is weakly coupled at CMB scales. In this talk, I will show that for models with a scale dependent sound speed, the system can become strongly coupled at lower scale. I will also discuss multiple field models which can produce non-Gaussianity at CMB scales. In these scenarios, the extra scalar fields are strongly coupled in a large part of the parameter space.

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