Ground state energy density of a dilute Bose gas in the canonical transformation
Abstract
A ground state energy density of an interacting dilute Bose gas system is studied in the canonical transformation scheme. It is shown that the transformation scheme enables us to calculate a higher order correction of order n a3 in the particle depletion and ground state energy density of a dilute Bose gas system, which corresponds to the density fluctuation contribution from the excited states. The coefficient of n a3 term is shown to be 2(π - 8/3) for the particle depletion, and 16(π - 8/3) for the ground state energy density.
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