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Schwinger had a mixed relationship with his colleagues, because he always pursued independent research, different from mainstream fashion. 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 ...
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.
The original Schwinger effect of quantum electrodynamics has never been observed due to the extremely strong electric-field strengths required. Pair production takes place exponentially slowly when the electric field strength is much below the Schwinger limit, corresponding to approximately 10 18 V/m. With current and planned laser facilities ...
Action principles are "integral" approaches rather than the "differential" approach of Newtonian mechanics.[2]: 162 The core ideas are based on energy, paths, an energy function called the Lagrangian along paths, and selection of a path according to the "action", a continuous sum or integral of the Lagrangian along the path.
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
It was introduced by Pascual Jordan in 1935 [1] and was utilized by Julian Schwinger [2] in 1952 to re-work out the theory of quantum angular momentum efficiently, given that map’s ease of organizing the (symmetric) representations of su(2) in Fock space.
In non-equilibrium physics, the Keldysh formalism or Keldysh–Schwinger formalism is a general framework for describing the quantum mechanical evolution of a system in a non-equilibrium state or systems subject to time varying external fields (electrical field, magnetic field etc.).