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 $\lambda /4!{\varphi }^4$ in de~Sitter spacetime and present a diagrammatic expansion that describes the field as driven by stoch…