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- W2078114075 abstract "A grand canonical system of hard-core bosons, subject to thermal fluctuations, is studied on a lattice. Starting from the slave-boson representation with fields for occupied and unoccupied sites, an effective field theory is derived in which a complex field corresponds with the order parameter of the condensate and a real field with the total density of bosons. Near the boundary between the normal and the superfluid phase, we obtain the Ginzburg-Landau functional for the superfluid order parameter. A mean-field calculation shows that the critical temperature ${T}_{c}$ increases with increasing density up to a maximum and decreases with further increasing density." @default.
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- W2078114075 title "Condensation of a hard-core Bose gas" @default.
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- W2078114075 doi "https://doi.org/10.1103/physreva.62.023611" @default.
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