Propagation phenomena for KPP equations with general time-dependence 13 mars 201227 février 2012 adminFrumam Carte non disponible Date/heure Date(s) - 13/03/201210 h 00 min - 11 h 00 min Catégories Pas de Catégories We investigate the existence of generalized transition waves for reaction-diffusion equations with monostable nonlinearities depending in general way on time. It is well known that in the homogeneous case the family of speeds associated with traveling fronts is given by a right half-line. In collaboration with G. Nadin, we have extended this result by introducing a suitable notion of mean. As an application, we have derived the existence of random traveling waves when the nonlinearity is stationary ergodic. We further discuss some extensions to the case obtained by adding a space periodic dependence, which is a work in progress with L. Ryzhik.