Résumé / Abstract Seminaire_GReCO

"Beyond perturbation theory in inflation"

Vicharit Yingcharoenrat
Scuola Internazionale Superiore Studi Avanzati (Trieste, Italie)

In this talk I will first discuss a motivation why one needs to go beyond perturbation theory (PT) in inflation as going to the tail of the distribution of the primordial fluctuations. Then I will propose that the way to go beyond PT is equivalent to performing a calculation in the semi-classical limit. As an analogy, I will show a simple calculation of the ground-state wavefunction in the semi-classical limit for an anharmonic oscillator. After that, I will move to a toy model of inflation which for simplicity involves only derivative couplings. As a result, the wavefunction of the Universe in this semi-classical limit exhibits a non-perturbative behaviour in the large field limit.

lundi 19 avril 2021 - 11:00
Institut d'Astrophysique de Paris

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