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Wigner about Einstein

[Einstein] believed in the concentration of the energy in quanta and that these quanta have structures similar to particles. However, their motion is governed by what he called Führungsfeld - that is, "guiding field" - and this obeys the equations of electrodynamics. [... But he] never published the Führungsfeld idea.

[p. 262 of E.P. Wigner: "Interpretation of Quantum Mechanics" (1976), (reprinted) in: Quantum Theory and Measurement, ed. by J.A. Wheeler and W.H. Zurek (Princeton University Press, 1983)]

In order to explain [the wave-particle] duality of [the] behavior [of light], Einstein proposed the idea of a "guiding field" (Führungsfeld). This field obeys the field equation for light, that is Maxwell's equation. However, the field only serves to guide the light quanta or particles, they move into regions where the intensity of the field is high. This picture [...] has, obviously, many attractive features. Yet Einstein, though in a way he was fond of it, never published it.

[p. 463 of E.P. Wigner: "Thirty Years of Knowing Einstein", in: Some Strangeness in the Proportion: A Centennial Symposium to Celebrate the Achievements of Albert Einstein, ed. by H. Woolf (Addison-Wesley, Reading MA, 1980)]

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