PIRSA:08060163

Limits from the Perturbative Regime of Inflation and Non-Gaussianity

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}}
          }

Louis Leblond

Pennsylvania State University

Talk number
PIRSA:08060163
Collection
Talk Type
Subject
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.