Nonequilibrium steady states for certain Hamiltonian models

Kevin K. Lin, Lai Sang Young

Research output: Contribution to journalArticlepeer-review


We report the results of a numerical study of nonequilibrium steady states for a class of Hamiltonian models. In these models of coupled matter-energy transport, particles exchange energy through collisions with pinned-down rotating disks. In Commun. Math. Phys. 262, 237-267, 2006, Eckmann and Young studied 1D chains and showed that certain simple formulas give excellent approximations of energy and particle density profiles. Keeping the basic mode of interaction in Commun. Math. Phys. 262, 237-267, 2006, we extend their prediction scheme to a number of new settings: 2D systems on different lattices, driven by a variety of boundary (heat bath) conditions including the use of thermostats. Particle-conserving models of the same type are shown to behave similarly. The second half of this paper examines memory and finite-size effects, which appear to impact only minimally the profiles of the models tested in Commun. Math. Phys. 262, 237-267, 2006. We demonstrate that these effects can be significant or insignificant depending on the local geometry. Dynamical mechanisms are proposed, and in the case of directional bias in particle trajectories due to memory, correction schemes are derived and shown to give accurate predictions.

Original languageEnglish (US)
Pages (from-to)630-657
Number of pages28
JournalJournal of Statistical Physics
Issue number4
StatePublished - May 2010


  • Energy profiles
  • Finite-size effects
  • Hamiltonian models
  • Memory effects
  • Nonequilibrium steady states
  • Particle densities

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics


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