Superhorizon curvature perturbation in ultraslow-roll inflation

Shu Lin Cheng, Wolung Lee, Kin Wang Ng

研究成果: 雜誌貢獻文章同行評審

6 引文 斯高帕斯(Scopus)

摘要

We study the growth of superhorizon modes in the curvature perturbation during an ultraslow-roll or a large-η phase in single-field inflation. In a simple toy model, we derive the two-point correlation function of the curvature perturbation and show that the requirement for causality restricts the growth rate and hence puts a lower limit on the value of η. The toy model is then realized by considering an inflation potential with an inflection point. Our study is useful to assessing the growth of the curvature perturbation that seeds the formation of primordial black holes.

原文英語
文章編號063524
期刊Physical Review D
99
發行號6
DOIs
出版狀態已發佈 - 2019 三月 15

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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