EAN: 9783319201276

SPRINGERBRIEFS IN PHYSICS SCHWINGERS QUANTUM ...

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.

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