Speaker:	Keisuke Inomata (JHU)
Title:	Curvature Perturbations Protected Against One Loop
Date (JST):	Thu, Jul 04, 2024, 13:30 - 15:00
Place:	Seminar Room A
Abstract:	I examine one-loop corrections from small-scale curvature perturbations to the superhorizon-limit ones in single-field inflation models, which have recently caused controversy. I consider the case where the Universe experiences transitions of slow-roll (SR) → intermediate period → SR. The intermediate period can be an ultra-slow-roll period or a resonant amplification period, either of which enhances small-scale curvature perturbations. I assume that the superhorizon curvature perturbations are conserved at least during each of the SR periods. Within this framework, I show that the superhorizon curvature perturbations during the first and the second SR periods coincide at one-loop level in the slow-roll limit. This talk is based on arXiv:2403.04682.

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