Worldline instantons for nonperturbative particle production by space and time dependent gravitational fields
Philip Semrén, Greger Torgrimsson
原始摘要（英文原文）· Original abstract
We develop a worldline-instanton approach for calculating the momentum spectrum of particles produced by gravitational fields that depend on both space and time. The instantons are open. The middle part is complex and describes the formation region, while the ends describe the trajectories of asymptotic particles.