# Macroscopic diffusion from a Hamilton-like dynamics

- Authors
- Publication Date
- Nov 03, 2012
- Source
- Hal-Diderot
- Keywords
- Language
- English
- License
- Unknown
- External links

## Abstract

We introduce and analyze a model for the transport of particles or energy in extended lattice systems. The dynamics of the model has all the properties of Hamiltonian dynamics in a confined phase space : it is deterministic, periodic, reversible and conservative. Randomness enters the model as a way to model ignorance about initial conditions and interactions between the components of the system. The orbits of the particles are non-intersecting random loops. We prove, as a weak law of large number, the validity of a diffusion equation for the macroscopic observables of interest for time arbitrary large, but small compared to the minimal recurrence time in the dynamics.