Speaker
Ryusuke Jinno
(DESY)
Description
This talk is consists of two parts. In the first part I will talk about curvature perturbation produced in very strong first-order phase transitions. I will first explain super-hubble curvature perturbation based on 2311.16222, and then move on to hubble-scale curvature perturbation based on 2503.01962. In the second part I change the topic completely and talk about a new type of formulation of quantum tunneling that features positive-definite action based on my ongoing work.
