Nonequilibrated oscillations of coherence in coupled nonlinear wave systems.
We show that a conservative system of a pair of coupled incoherent nonlinear waves exhibits huge oscillations of coherence, which are characterized by a recurrent transfer of noise fluctuations between the coupled waves. This sustained oscillatory behavior is in contradiction with the expected irreversible evolution towards equilibrium. As a consequence, the process of coherence transfer is characterized by a reduction of nonequilibrium entropy, which violates the H theorem of entropy growth inherent to the kinetic theory.
CNRS-LPUB, Laboratoire de Physique de l'Université de Bourgogne, Dijon, France.
Antonio
A
Picozzi