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The properties of liquid helium at very low temperatures (below 0.5°K) are discussed from the atomic point of view. It is argued that the lowest states are compressional waves (phonons). Long-range motions which leave density unaltered (stirrings) are impossible for Bose statistics since they...
A new type of representation of the wave function of quantum mechanics, and a new form of the statistical interpretation of the wave function, are presented. The variable in the new representation is a mapping of points of differential space, closely related to Hilbert space, but having an...
The dissociation region of oxygen molecules is treated in the same "self-consistent" manner described in previous papers, except that now the densities of atomic and molecular oxygen have been calculated as functions of the altitude, on the assumption that the main recombination process between...
Three methods of handling problems in relativistic quantum mechanics are discussed. One is the Tamm-Dancoff method, one is the Bethe-Salpeter method, and the third is a new method intermediate between the other two. The connections between the three methods are investigated. It is shown that the...
We examine the problem of two holes in an otherwise filled band, or two electrons in an empty band, by the method of configuration interaction, using Wannier functions, asking which state lies lower, the triplet or singlet. If the triplet lies lower, it would indicate that the spins set...
It is shown from first principles that, in spite of the large interatomic forces, liquid He 4 should exhibit a transition analogous to the transition in an ideal Bose-Einstein gas. The exact partition function is written as an integral over trajectories, using the space-time approach to quantum...
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