Seminarium "Teoria cząstek elementarnych i kosmologia"

Our Universe is permeated by both gravitational waves and matter. An intriguing question is whether a background of gravitational waves can influence particle processes in the matter sector. A particularly interesting example is the decay of dark matter, where one might naively expect a significant Bose enhancement for decay channels that emit gravitons. In this talk, I will examine how a gravitational-wave background affects particle decay by extending Weinberg’s soft theorem to situations in which a soft background is present.This talk is based on our recent work: arXiv:2510.27690.