Leading log solution for inflationary Yukawa theory

摘要: We generalize Starobinskii's stochastic technique to the theory of a massless, minimally coupled scalar interacting with massless fermion in locally de Sitter geometry. The is an 'active' field that can engender infrared logarithms. passive cannot cause logarithms but which carry them, and also induce new interactions between active fields. procedure for dealing fields integrate them out, then stochastically simplify resulting effective action following Starobinskii. Because Yukawa quadratic this be done explicitly using classic solution Candelas Raine. check formulation against explicit two loop computation. derive nonperturbative, leading log result stress tensor. potential induced by fermions unbounded below, backreaction from model might dynamically cancel arbitrarily large cosmological constant.