2000 character limit reached
Crossing singularities in the saddle point approximation (2309.12427v1)
Published 21 Sep 2023 in quant-ph and hep-th
Abstract: We describe a new phenomenon in the study of the real-time path integral, where complex classical paths hit singularities of the potential and need to be analytically continued beyond the space for which they solve the boundary value problem. We show that the behavior is universal and central to the problem of quantum tunneling. These analytically continued complex classical paths enrich the study of real-time Feynman path integrals.
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