Evaluation of the semiclassical coherent state propagator in the   presence of phase space caustics
  A uniform approximation for the coherent state propagator, valid in the vicinity of phase space caustics, was recently obtained using the Maslov method combined with a dual representation for coherent states. In this paper we review the derivation of this formula and apply it to two model systems: the one-dimensional quartic oscillator and a two-dimensional chaotic system. 
A D Ribeiro and M A M de Aguiar