Feshbach Resonance and Growth of a Bose-Einstein Condensate
  Gross-Pitaevskii equation with gain is used to model Bose Einstein condensation (BEC) fed by the surrounding thermal cloud. It is shown that the number of atoms continuously injected into BEC from the reservoir can be controlled by applying the external magnetic field via Feshbach resonance. 
C. Yuce and A. Kilic