The Feynman iϵ prescription displaces poles or tilts an integration contour by an infinitesimal imaginary part. It selects vacuum boundary conditions and damps oscillatory integrals at infinite time.
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- Four-point tree amplitude in phi cubed theory
- Gaussian generating functional for a Dirac field
- Harmonic oscillator transition kernel
- Inversion of the gauge-fixed Maxwell kinetic operator
- Mostly-plus Dirac propagator with a real derivative kernel
- One-loop ghost kinetic counterterm in Feynman gauge
- Operator-path-integral equivalence
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- Positive-sign covariant gauge-fixing inverse
- Scalar Feynman propagator pole prescription
- Scalar triangle Feynman integral
- Symmetric two-propagator expansion
- Time-ordered correlation function
- Transverse and longitudinal momentum projectors
- Vacuum functional
- Vacuum projection by imaginary time
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