• Corpus ID: 119284504

Deriving Z[J] from the time evolution operator

  title={Deriving Z[J] from the time evolution operator},
  author={Dan Solomon},
  journal={arXiv: Quantum Physics},
  • D. Solomon
  • Published 30 May 2014
  • Physics
  • arXiv: Quantum Physics
An important quantity in quantum field theory is the vacuum-to-vacuum transition amplitude in the presence of an external source. This quantity is often designated by Z[J] and is the generator for the n-point Greens functions. In textbooks Z[J] is often derived using a path integral formulation, however it will be shown here that it is possible to derive Z[J] directly from the time evolution operator without using the path integral formulation. 


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