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 numberPIRSA:08060163
DOI10.48660/08060163
Collection
Talk Type Conference
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.