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- W2066445576 abstract "The quantum field Hamiltonian expressed in terms of density and current density variables has been employed together with the equal-time commutation relations among these variables to find the ground state energy and the density fluctuation excitation spectrum of a system of interacting bosons at T = 0°K. The approximation involved consists in assuming that the density fluctuation in space is small compared with the average density. The results easily obtained in the lowest-order approximation agree with those of Bogoliubov. However, in our treatment no condensation of particles in zero-momentum state is assumed or apparent. A connection between the present treatment and the quantum hydrodynamic approach to the irrotational flow of a Bose liquid has been made." @default.
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- W2066445576 date "1971-06-01" @default.
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- W2066445576 title "Density and Current Density as Coordinates for a System of Interacting Bosons at Absolute Zero" @default.
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- W2066445576 doi "https://doi.org/10.1063/1.1665691" @default.
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