1-5 July 2019
Faculty of Physics, University of Warsaw
Europe/Warsaw timezone

Stability of de Sitter spacetime against the backreaction of the infrared modes of scalar fields

4 Jul 2019, 15:30
20m
Faculty of Physics, University of Warsaw

Faculty of Physics, University of Warsaw

conference hall 0.03, Faculty of Physics, University of Warsaw ul. Pasteura 5, 02-093 Warszawa Poland
contributed talk Beyond IV

Speaker

Gabriel Moreau (Université Paris Diderot)

Description

We study the back-reaction of the infrared modes of an O(N) scalar theory in a classical de Sitter background. We use the nonperturbative renormalization group methods to extract analytically the flow of the Hubble constant as the gravitationally enhanced long wavelength modes are integrated out. For a massless theory, the interactions tend to renormalize negatively the Hubble constant, thus drawing energy from the classical gravitational field. This phenomenon saturates however, and unbounded loop corrections are screened by nonperturbative effects which stabilise the geometry.

Based on : G. Moreau and J. Serreau, Phys. Rev. Lett. 122 (2019) no.1, 011302, Phys. Rev. D 99 (2019) no.2, 025011

Primary authors

Gabriel Moreau (Université Paris Diderot) Julien Serreau (Université Paris Diderot)

Presentation Materials