107 citations · 346 across the 6 of their papers we have counts for
4 papers · 1 filter
Scalar field correlator in de Sitter space at next-to-leading order in a 1/N expansion
Florian Gautier, Julien Serreau
We study the dynamics of light quantum scalar fields in de Sitter space on superhorizon scales. We compute the self-energy of an O(N) symmetric theory at next-to-leading order in a…
Feynman Diagrams for Stochastic Inflation and Quantum Field Theory in de Sitter Space
Bjorn Garbrecht, Florian Gautier, Gerasimos Rigopoulos +1
We consider a massive scalar field with quartic self-interaction in de~Sitter spacetime and present a diagrammatic expansion that describes the field as driven by stoch…
Infrared dynamics in de Sitter space from Schwinger-Dyson equations
Florian Gautier, Julien Serreau
We study the two-point correlator of an O(N) scalar field with quartic self-coupling in de Sitter space. For light fields in units of the expansion rate, perturbation theory is pla…
On the Langevin description of nonequilibrium quantum fields
Florian Gautier, Julien Serreau
We consider the non-equilibrium dynamics of a real quantum scalar field. We show the formal equivalence of the exact evolution equations for the statistical and spectral two-point…