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- W1985776913 abstract "The density fluctuation in a Bose gas interacting via a strong short-range repulsive potential and a weak long-range attractive potential is studied by the methods of quantum-field theory. The density-density correlation function is generated by taking the functional derivative of the single-particle matrix Green's function ${G}_{1}(1,2)$ with respect to an auxiliary scalar field. For ${G}_{1}(1,2)$, we use the Hartree approximation for the attractive potential and the Hartree-Fock approximation for the short-range repulsive potential. We show that the density fluctuation spectrum is identical to the Beliaev approximation for the single-particle excitation spectrum." @default.
- W1985776913 created "2016-06-24" @default.
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- W1985776913 date "1971-07-01" @default.
- W1985776913 modified "2023-09-23" @default.
- W1985776913 title "Density Fluctuations in an Interacting Bose Gas" @default.
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- W1985776913 doi "https://doi.org/10.1103/physreva.4.237" @default.
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