Special Seminar

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.