Leading log solution for inflationary Yukawa theory

S. P. Miao, R. P. Woodard

研究成果: Article同行評審

101 引文 斯高帕斯(Scopus)

摘要

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

原文English
文章編號044019
期刊Physical Review D - Particles, Fields, Gravitation and Cosmology
74
發行號4
DOIs
出版狀態Published - 2006

All Science Journal Classification (ASJC) codes

  • 核能與高能物理
  • 物理與天文學(雜項)

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