Worldline instantons for nonperturbative particle production by space and time dependent gravitational fields

Published 3 Aug 2025 in hep-th and gr-qc | (2508.01901v1)

Abstract: We develop a worldline-instanton approach for calculating the momentum spectrum of particles produced by gravitational fields which 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.

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