# Macroscopic diffusion from a Hamilton-like dynamics

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- Hal-Diderot
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## 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.