Feynman Diagram - Path Integral Formulation

Path Integral Formulation

In a path-integral, the field Lagrangian, integrated over all possible field histories, defines the probability amplitude to go from one field configuration to another. In order to make sense, the field theory should have a well-defined ground state, and the integral should be performed a little bit rotated into imaginary time.

Read more about this topic:  Feynman Diagram

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