Abstract
A microscopic theory is presented which interprets the Josephson oscillation in superfluid helium in the light of the Heisenberg equations for dressed-bosons.The equations are exactly solved to yield the solutions in the form of a linear combination of two eigen-oscillations. Consequently it is shown that the interference of these eigen-oscillations produces the Josephson oscillation in superfluid helium, and that the Josephson oscillation occurs even when the quantum fluctuation of the relative phase is infinitely large. These results lead us to propose an experiment to detect the tunneling effect of the dressed-bosons. The formulation in this paper can be applied to the Josephson oscillation in superconductors.
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