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Real-Time Feynman Path Integral Realization of Instantons

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arxiv 1408.0012 v2 pith:C5ZSLZX2 submitted 2014-07-31 hep-th

classification hep-th
keywords pathamplitudesfeynmanintegralsreal-timetheorytunnelingassociated
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Which Saddles Contribute? The South-East Rule for Multidimensional Integrals

    math-ph 2026-06 unverdicted novelty 7.0 of 10

    A geometric South-East rule combined with Borel-plane values and resurgence adjacency identifies contributing critical points for asymptotics of integrals e^{i k f(x)} over R^d without Picard-Lefschetz flows.

  2. Which Saddles Contribute? The South-East Rule for Multidimensional Integrals

    math-ph 2026-06 conditional novelty 7.0 of 10

    A proposed "South-East rule" reads the directions of edges in a Borel-plane adjacency graph of critical values to decide, without steepest-descent flow computations, which complex and real saddles contribute to multid...

  3. Path integral analysis of Schr\"odinger-type eigenvalue problems in the complex plane: Establishing the relation between instantons and resonant states

    hep-th 2025-07 conditional novelty 6.0 of 10

    Path integrals on complex contours that terminate in prescribed Stokes sectors yield spectral formulas for resonant energies, explaining why the instanton bounce calculation and real-time decay rates agree.

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