Statistical physics and fluctuations in ballistic nonequilibrium systems
Abstract
In nonequilibrium systems in the ballistic transport regime, every point of the system contains particles arriving from different regionseach of them at different temperaturesand there are only few collisions, in such a way that equilibrium between the different populations will be reached very slowly. Here, we tentatively approach the local distribution function by a superposition of localequilibrium distribution functions with different temperatures, corresponding to the different starting positions of the particles. In a secondorder expansion, we find a distribution function which depends not only on the Hamiltonian H but also on H^{2}, and we study the additional contribution to energy fluctuations.
 Publication:

Physica A Statistical Mechanics and its Applications
 Pub Date:
 June 2009
 DOI:
 10.1016/j.physa.2009.02.030
 Bibcode:
 2009PhyA..388.2367A