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In particular, Schwinger developed the source theory, [9] a phenomenological theory for the physics of elementary particles, which is a predecessor of the modern effective field theory. It treats quantum fields as long-distance phenomena and uses auxiliary 'sources' that resemble currents in classical field theories.
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]
Based on Schwinger's source theory, Steven Weinberg established the foundations of the effective field theory, which is widely appreciated among physicists. Despite the " shoes incident ", Weinberg gave the credit to Schwinger for catalyzing this theoretical framework.
Its development began in the 1920s with the description of interactions between light and electrons, culminating in the first quantum field theory—quantum electrodynamics. A major theoretical obstacle soon followed with the appearance and persistence of various infinities in perturbative calculations, a problem only resolved in the 1950s with ...
In physics, the Schwinger model, named after Julian Schwinger, is the model [1] describing 1+1D (1 spatial dimension + time) Lorentzian quantum electrodynamics which includes electrons, coupled to photons. The model defines the usual QED Lagrangian
The effect was originally proposed by Fritz Sauter in 1931 [1] and further important work was carried out by Werner Heisenberg and Hans Heinrich Euler in 1936, [2] though it was not until 1951 that Julian Schwinger gave a complete theoretical description. [3] The Schwinger effect can be thought of as vacuum decay in the presence of an electric ...
The CPT theorem appeared for the first time, implicitly, in the work of Julian Schwinger in 1951 to prove the connection between spin and statistics. [3] In 1954, Gerhart Lüders and Wolfgang Pauli derived more explicit proofs, [4] [5] so this theorem is sometimes known as the Lüders–Pauli theorem.
Both Richard Feynman and Julian Schwinger developed quantum action principles based on early work by Paul Dirac. Feynman's integral method was not a variational principle but reduces to the classical least action principle; it led to his Feynman diagrams. Schwinger's differential approach relates infinitesimal amplitude changes to infinitesimal ...