Statistical physics and fluctuations in ballistic non-equilibrium systems

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In nonequilibrium systems in the ballistic transport regime, every point of the system contains particles arriving from different regions-each of them at different temperatures-and 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 local-equilibrium distribution functions with different temperatures, corresponding to the different starting positions of the particles. In a second-order expansion, we find a distribution function which depends not only on the Hamiltonian H but also on H2, and we study the additional contribution to energy fluctuations. © 2009 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)2367-2372
JournalPhysica A: Statistical Mechanics and its Applications
Publication statusPublished - 15 Jun 2009


  • Ballistic transport
  • Canonical ensemble
  • Heat transport
  • Nonequilibrium thermodynamics

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