Summing inflationary logarithms in nonlinear sigma models

S. P. Miao, N. C. Tsamis, R. P. Woodard

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

We consider two nonlinear sigma models on de Sitter background which involve the same derivative interactions as quantum gravity but without the gauge issue. The first model contains only a single field, which can be reduced to a free theory by a local field redefinition; the second contains two fields and cannot be so reduced. Loop corrections in both models produce large temporal and spatial logarithms which cause perturbation theory to break down at late times and large distances. Many of these logarithms derive from the “tail” part of the propagator and can be summed using a variant of Starobinsky’s stochastic formalism involving a curvature-dependent effective potential. The remaining logarithms derive from the ultraviolet and can be summed using a variant of the renormalization group based on a special class of curvature-dependent renormalizations. Explicit results are derived at 1-loop and 2-loop orders.

原文English
文章編號69
期刊Journal of High Energy Physics
2022
發行號3
DOIs
出版狀態Published - 2022 3月

All Science Journal Classification (ASJC) codes

  • 核能與高能物理

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