The Schwinger's quantum action principle is a variational approach to quantum mechanics and quantum field theory.[1][2] This theory was introduced by Julian Schwinger in a series of articles starting 1950.[3]
- ^ Schwinger, Julian (2001). Englert, Berthold-Georg (ed.). Quantum Mechanics. Berlin, Heidelberg: Springer Berlin Heidelberg. doi:10.1007/978-3-662-04589-3. ISBN 978-3-642-07467-7.
- ^ Dittrich, Walter (2021), "The Quantum Action Principle", The Development of the Action Principle, SpringerBriefs in Physics, Cham: Springer International Publishing, pp. 79–82, doi:10.1007/978-3-030-69105-9_11, ISBN 978-3-030-69104-2, S2CID 236705758, retrieved 2022-10-19
- ^ Schweber, Silvan S. (2005-05-31). "The sources of Schwinger's Green's functions". Proceedings of the National Academy of Sciences. 102 (22): 7783–7788. doi:10.1073/pnas.0405167101. ISSN 0027-8424. PMC 1142349. PMID 15930139.
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