Abstract
The expectation value of the pair density operator is calculated for a dilute Bose system in which the excitations move with drift velocity u with respect to the free-particle ground state. In general - 2 depends on the drift velocity u and the angle ψ between u and r = x - y. For very large r, - 2 is found to vanish as r-4, and to become practically independent of u and ψ.
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