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101 0 $aeng
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181   $ctxt
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183   $acr
200 10$aSchwinger's Quantum Action Principle $eFrom Dirac?s Formulation Through Feynman?s Path Integrals, the Schwinger-Keldysh Method, Quantum Field Theory, to Source Theory /$fby Kimball A. Milton
205   $a1st ed. 2015.
210  1$aCham :$cSpringer International Publishing :$cImprint: Springer,$d2015.
215   $a1 online resource (122 p.)
225 1 $aSpringerBriefs in Physics,$x2191-5423
300   $aDescription based upon print version of record.
311   $a3-319-20127-1 
320   $aIncludes bibliographical references.
327   $aHistorical introduction -- Review of classical action principles -- Classical field theory - electrodynamics -- Quantum Action Principle -- Time-cycle or Schwinger-keldysh Formulation -- Relativistic Theory of Fields -- Nonrelativistic Source theory -- Concluding remarks.
330   $aStarting from the earlier notions of stationary action principles, these tutorial notes shows how Schwinger?s Quantum Action Principle descended from Dirac?s formulation, which independently led Feynman to his path-integral formulation of quantum mechanics. Part I brings out in more detail the connection between the two formulations, and applications are discussed. Then, the Keldysh-Schwinger time-cycle method of extracting matrix elements is described. Part II will discuss the variational formulation of quantum electrodynamics and the development of source theory.
410  0$aSpringerBriefs in Physics,$x2191-5423
606   $aQuantum theory
606   $aPhysics
606   $aMathematical physics
606   $aQuantum Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P19080
606   $aHistory and Philosophical Foundations of Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P29000
606   $aMathematical Applications in the Physical Sciences$3https://scigraph.springernature.com/ontologies/product-market-codes/M13120
606   $aMathematical Methods in Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P19013
615  0$aQuantum theory.
615  0$aPhysics.
615  0$aMathematical physics.
615 14$aQuantum Physics.
615 24$aHistory and Philosophical Foundations of Physics.
615 24$aMathematical Applications in the Physical Sciences.
615 24$aMathematical Methods in Physics.
676   $a530.143
700   $aMilton$b Kimball A$4aut$4http://id.loc.gov/vocabulary/relators/aut$0532655
801  0$bMiAaPQ
801  1$bMiAaPQ
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906   $aBOOK
912   $a9910739419603321
996   $aSchwinger's Quantum Action Principle$91772332
997   $aUNINA