|Phase coexistence in nonequilibrium reaction-diffusion systems: Exact results|
|vendredi 28 mai 2004 , 09h00|
|Conférence présentée à l'atelier (2004)|
We study the flow of fluctuations in driven diffusive systems with two conserved densities. This yields a criterion for the microscopic stability of shocks. We also investigate the hydrodynamic limit on the Euler scale and obtain two coupled nonlinear PDE's for the evolution of the local density. For the selection of the physical solution of this system of conservation laws we introduce a viscosity matrix. Simulation of a specific lattice model suggests that, unlike in one-component systems, the choice of the infinitesimal viscosity term is not irrelevant in finite systems. This raises the unexpected question how the physical viscosity term has to be determined. For a special class of systems we propose a prescription that reproduces Monte-Carlo data reasonably well.