  A quantum Langevin equation for the amplitudes of the collective modes in
Bose-Einstein condensate is derived. The collective modes are coupled to a
thermal reservoir of quasi-particles, whose elimination leads to the quantum
Langevin equation. The dissipation rates are determined via the correlation
function of the fluctuating force and are evaluated in the local-density
approximation for the spectrum of quasi-particles and the Thomas-Fermi
approximation for the condensate. I take great pleasure in dedicating this
paper to Gregoire Nicolis on the occasion of his sixtieth birthday.

Soft Condensed Matter