Kramers and non-Kramers Phase Transitions in Many-Particle Systems with   Dynamical Constraint
  We study a Fokker-Planck equation with double-well potential that is nonlocally driven by a dynamical constraint and involves two small parameters. Relying on formal asymptotics we identify several parameter regimes and derive reduced dynamical models for different types of phase transitions. 
Michael Herrmann and Barbara Niethammer and Juan J.L. Vel\'azquez
math.AP math-ph math.MP