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PIRSA:08060163

Limits from the Perturbative Regime of Inflation and Non-Gaussianity

APA

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

Louis Leblond Pennsylvania State University

Talk numberPIRSA:08060163
Source RepositoryPIRSA
Collection

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.