Résumé / Abstract Seminaire_GReCO

"Infrared dynamics of interacting scalar fields in de Sitter space "

Julien Serreau
Laboratoire AstroParticule et Comologie, Université Paris Diderot (Paris, France)

I review recent progress in understanding the dynamics of light self-interacting scalar fields in de Sitter space at low (superhorizon) momenta. In this regime, perturbation theory is plagued by secular/infrared divergences due to the gravitational amplification of long wavelength quantum fluctuation and a correct description requires resummation schemes and/or nonperturbative tools. I present results based on large-N techniques, solutions of the Dyson-Schwinger equations, and nonperturbative renormalization group methods. The gravitationally enhanced infrared fluctuations trigger dramatic phenomena such as the radiative restoration of spontaneously broken symmetries.

mardi 22 mai 2018 - 11:00
Salle des séminaires Évry Schatzman,
Institut d'Astrophysique de Paris

Page web du séminaire / Seminar's webpage