"Cherenkov radiation" of a sound in a Bose-condensed gas

D. L. Kovrizhin, L. A. Maksimov

Published 2001-09-13Version 1

In terms of linearized Gross-Pitaevskii equation we have studied the process of sound emission arises from a supersonic particle motion in a Bose-condensed gas. By analogy with the method used for description of Vavilov-Cherenkov phenomenon, we have found a friction work created by the particle generated condensate polarization. For comparison we have found radiation intensity of excitations. Both methods gives the same result.