Nonequilibrium Cooper pairing in the nonadiabatic regime
  We obtain a complete solution for the mean-field dynamics of the BCS paired state with a large, but finite number of Cooper pairs in the non-adiabatic regime. We show that the problem reduces to a classical integrable Hamiltonian system and derive a complete set of its integrals of motion. The condensate exhibits irregular multi-frequency oscillations ergodically exploring the part of the phase-space allowed by the conservation laws. In the thermodynamic limit however the system can asymptotically reach a steady state. 
Emil A. Yuzbashyan, Boris L. Altshuler, Vadim B. Kuznetsov, Victor Z.   Enolskii