Copied Schwinger's Quantum Action Principle
Schwinger's Quantum Action Principle
Starting from the earlier notions of stationary action principles, these tutorial notes shows how Schwingers Quantum Action Principle descended from Diracs formulation, which independently led Feynman to his path-integral formulation of quantum mechanics. Part I brings out in more detail the connection between the two formulations, and applications are discussed. Then, the Keldysh-Schwinger time-cycle method of extracting matrix elements is described. Part II will discuss the variational formulation of quantum electrodynamics and the development of source theory.
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