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- W2085877350 abstract "The problem of a system of bosons at zero temperature, interacting via a strong short-ranged repulsive interaction and a weak long-ranged attraction, is treated by the methods of quantum-field theory. It is shown that if the parameters of the attractive part of the interaction are suitably restricted, an approximation to the self-energy parts of the Green's functions, similar to that used by Beliaev for the case of purely repulsive interactions, leads to an excitation spectrum which in the limit of small momenta represents phonons. The approximation also yields an $N$-body bound state corresponding to zero pressure. Apart from minor differences, these results are in agreement with an earlier calculation of Huang." @default.
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- W2085877350 date "1967-10-05" @default.
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- W2085877350 title "System of Bosons with Attractive Interactions" @default.
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- W2085877350 doi "https://doi.org/10.1103/physrev.162.173" @default.
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