Microscopic Theory of Drag in a Bose Condensate Interacting with a Moving Reservoir
The paper derives a microscopic theory for drag when a Bose-Einstein condensate interacts with a moving reservoir of fermions. By integrating out the reservoir degrees of freedom using Born-Markov approximations, an effective Gross-Pitaevskii equation with a drag potential is obtained. This potential determines an effective drag force and coefficient based on reservoir fluctuations and condensate density.