Real-Time Feynman Path Integral Realization of Instantons
arXiv:1408.0012
Abstract
In Euclidean path integrals, quantum mechanical tunneling amplitudes are associated with instanton configurations. We explain how tunneling amplitudes are encoded in real-time Feynman path integrals. The essential steps are borrowed from Picard-Lefschetz theory and resurgence theory.
v1, 5 pages, 2 figures. v2: typos fixed, references added