Schwinger's Quantum Action Principle
From Dirac’s Formulation Through Feynman’s Path Integrals, the Schwinger-Keldysh Method, Quantum Field Theory, to Source Theory| By: | Kimball A. Milton |
| Publisher: | Springer Nature |
| Print ISBN: | 9783319201276 |
| eText ISBN: | 9783319201283 |
| Edition: | 0 |
| Copyright: | 2015 |
| Format: | Page Fidelity |
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Starting from the earlier notions of stationary action principles, these tutorial notes shows how Schwinger’s Quantum Action Principle descended from Dirac’s 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.