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- W2045743820 abstract "In the first paper of this series, the master-graph formulation of the Lee-Yang quantum statistical theory for a degenerate Bose system was derived. In the present paper, this entire theory is transformed from a free-particle description to a quasiparticle description by means of a $ensuremath{Lambda}$ transformation. This transformation leaves the master-graph formulation of the theory essentially unchanged, while at the same time introducing the quasiparticle energy-momentum relation and the quasiparticle interaction function into the theory. The transformation is motivated by a study of the very low-temperature behavior of the fundamental integral equation of the theory. An interesting feature of the transformed theory is that it contains two quasiparticle energy-momentum relations, ${ensuremath{epsilon}}_{+}(k)$ and ${ensuremath{epsilon}}_{ensuremath{-}}(k)$. The understanding of this result is not achieved in this paper, although the possibility of a double quasiparticle spectrum has previously been suggested by Lieb." @default.
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- W2045743820 date "1964-08-17" @default.
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- W2045743820 title "Degenerate Bose System. II.ΛTransformation of Quantum Statistical Theory" @default.
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- W2045743820 doi "https://doi.org/10.1103/physrev.135.a855" @default.
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