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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]
The Schwinger effect is a predicted physical phenomenon whereby matter is created by a strong electric field. It is also referred to as the Sauter–Schwinger effect , Schwinger mechanism , or Schwinger pair production .
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.
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 Lippmann–Schwinger equation's general form is ... the Lippmann–Schwinger equation has counterparts in homogenization theory (e.g. mechanics, conductivity ...
Kubo–Martin–Schwinger condition as featured on a monument in front of Warsaw University's Centre of New Technologies. In the statistical mechanics of quantum mechanical systems and quantum field theory, the properties of a system in thermal equilibrium can be described by a mathematical object called a Kubo–Martin–Schwinger (KMS) state: a state satisfying the KMS condition.
The Osterwalder–Schrader theorem [4] states that Euclidean Schwinger functions which satisfy the above axioms (E0)-(E4) and an additional property (E0') called linear growth condition can be analytically continued to Lorentzian Wightman distributions which satisfy Wightman axioms and thus define a quantum field theory.