Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series APC-TH
Subjects hep-th
Date Tuesday 22 May 2018
Time 14:00
Institute APC
Seminar Room 483 A - Malevitch
Speaker's Last Name Rigopoulos
Speaker's First Name Gerasimos
Speaker's Email Address
Speaker's Institution University of Newcastle
Title Stochastic effective action for a spectator scalar in inflation
Abstract We discuss the IR dynamics of a light scalar field in inflation. We demonstrate from a functional integral perspective how the full quantum theory gives rise to Starobinsky's semi-classical and local stochastic description when the field is smoothed on scales comparable to the Hubble horizon. We then apply the functional renormalization group to the stochastic dynamics by progressively integrating out frequencies. The resulting effective action determines the approach to equilibrium and allows for the computation of unequal time correlators for large time separations. Remarkably, the renormalization group flow for the stochastic effective potential agrees with that found previously using quantum field theory methods and a smoothing over spatial wavelengths. These results further support the notion that stochastic inflation captures the correct IR dynamics of light scalar fields in inflation.
arXiv Preprint Number

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