Velocity filtration and temperature inversion in a system with long-range interactions

Lapo Casetti 1, 2 Shamik Gupta 3

6 pages, 9 figures, epj macros. 2014

Temperature inversion due to velocity filtration, a mechanism originally proposed to explain the heating of the solar corona, is demonstrated to occur also in a simple paradigmatic model with long-range interactions, the Hamiltonian mean-field model. Using molecular dynamics simulations, we show that when the system settles into an inhomogeneous quasi-stationary state in which the velocity distribution has suprathermal tails, the temperature and density profiles are anticorrelated: denser parts of the system are colder than dilute ones. We argue that this may be a generic property of long-range interacting systems.

  • 1. INAF-Osservatorio Astrofisico di Arcetri
  • 2. Dipartimento di Fisica e Astronomia and CSDC
  • 3. LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques