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Physical Review

Self-Field Fluctuations and the Measurability of Electromagnetic Potentials in Quantum Mechanics

Ronald M. Rockmore

Published Jan 11, 1965• 0 citations
Publisher

Abstract

Some earlier considerations of Mitler on the significance of electromagnetic potentials in quantum theory which attempt to take properly into account the fluctuations of the vacuum are re-examined in terms of the conventional formalism of quantum field theory. It is shown that, contrary to the conclusions reached by Mitler, the effects of self-field fluctuations are indeed small, in substantial agreement with remarks of Aharonov and Bohm on this subject.

DOI
10.1103/physrev.137.b219

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Some earlier considerations of Mitler on the significance of electromagnetic potentials in quantum theory which attempt to take properly into account the fluctuations of the vacuum are re-examined in terms of the conventional formalism of quantum field theory. It is shown that, contrary to the conclusions reached by Mitler, the effects of self-field fluctuations are indeed small, in substantial agreement with remarks of Aharonov and Bohm on this subject.
There is a consensus today that the the main lesson of the Aharonov-Bohm effect is that a picture of electromagnetism based on the local action of the field strengths is not possible in quantum mechanics. Contrary to this statement, it is argued here that when the source of the electromagnetic potential is treated in the framework of quantum theory, the Aharonov-Bohm effect can be explained without the notion of potentials. It is explained by local action of the field of the electron on the source of the potential. The core of the Aharonov-Bohm effect is the same as the core of quantum entanglement: the quantum wave function describes all systems together.
In this paper, we discuss some interesting properties of the electromagnetic potentials in the quantum domain. We shall show that, contrary to the conclusions of classical mechanics, there exist effects of potentials on charged particles, even in the region where all the fields (and therefore the forces on the particles) vanish. We shall then discuss possible experiments to test these conclusions; and, finally, we shall suggest further possible developments in the interpretation of the potentials.
In this article, we start our discussion on the Aharonov-Bohm effect then raise a plausible interpretation within the quantum electrodynamics (QED) framework. We provide a quantum treatment of the source of the electromagnetic potential and argue that the underlying mechanism in AB effect can be viewed as interactions between electrons described by QED theory where the interactions are mediated by virtue photons. On further analysis, we claim that the framework of one particle quantum mechanics (OPQM) can be shown, in general, as a mathematically approximated model which can be reformulated from QED theory. In addition, the classical Maxwell equations are derived from QED scattering process while both classical electromagnetic fields and potentials serve as mathematical tools that are constructed to approximate the interactions among elementary particles described by QED physics, i.e. neither classical fields nor potentials represent any real entities of nature. At the conclusion of this article, we make a few remarks on the hypnosis of the existence of magnetic monopoles.
In this article, we discuss in further detail the significance of potentials in the quantum theory, and in so doing, we answer a number of arguments that have been raised against the conclusions of our first paper on the same subject. We then proceed to extend our treatment to include the sources of potentials quantum-mechanically, and we show that when this is done, the same results are obtained as those of our first paper, in which the potential was taken to be a specified function of space and time. In this way, we not only answer certain additional criticisms that have been made of the original treatment, but we also bring out more clearly the importance of the potential in the expression of the local character of the interaction of charged particles and the electromagnetic field.