Leblond, L. (2008). Limits from the Perturbative Regime of Inflation and Non-Gaussianity. Perimeter Institute for Theoretical Physics. https://pirsa.org/08060163
MLA
Leblond, Louis. Limits from the Perturbative Regime of Inflation and Non-Gaussianity. Perimeter Institute for Theoretical Physics, Jun. 05, 2008, https://pirsa.org/08060163
BibTex
@misc{ scivideos_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 for Theoretical Physics},
year = {2008},
month = {jun},
note = {PIRSA:08060163 see, \url{https://scivideos.org/pirsa/08060163}}
}
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.