The sign of the anomalous density in a dilute Bose gas is shown to depend on the unobservable condensate phase, while its absolute value is related to sound velocity and condensed fraction.
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On the anomalous density of a dilute homogeneous Bose gas
The sign of the anomalous density in a dilute Bose gas is shown to depend on the unobservable condensate phase, while its absolute value is related to sound velocity and condensed fraction.