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Stability criteria of the Vlasov equation and quasi-stationary states of the HMF model

Author

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  • Yamaguchi, Yoshiyuki Y.
  • Barré, Julien
  • Bouchet, Freddy
  • Dauxois, Thierry
  • Ruffo, Stefano

Abstract

We perform a detailed study of the relaxation towards equilibrium in the Hamiltonian Mean-Field model, a prototype for long-range interactions in N-particle dynamics. In particular, we point out the role played by the infinity of stationary states of the associated N→∞ Vlasov dynamics. In this context, we derive a new general criterion for the stability of any spatially homogeneous distribution, and compare its analytical predictions with numerical simulations of the Hamiltonian, finite N, dynamics. We then propose, and verify numerically, a scenario for the relaxation process, relying on the Vlasov equation. When starting from a nonstationary or a Vlasov unstable stationary state, the system shows initially a rapid convergence towards a stable stationary state of the Vlasov equation via nonstationary states: we characterize numerically this dynamical instability in the finite N system by introducing appropriate indicators. This first step of the evolution towards Boltzmann–Gibbs equilibrium is followed by a slow quasi-stationary process, that proceeds through different stable stationary states of the Vlasov equation. If the finite N system is initialized in a Vlasov stable homogeneous state, it remains trapped in a quasi-stationary state for times that increase with the nontrivial power law N1.7. Single particle momentum distributions in such a quasi-stationary regime do not have power-law tails, and hence cannot be fitted by the q-exponential distributions derived from Tsallis statistics.

Suggested Citation

  • Yamaguchi, Yoshiyuki Y. & Barré, Julien & Bouchet, Freddy & Dauxois, Thierry & Ruffo, Stefano, 2004. "Stability criteria of the Vlasov equation and quasi-stationary states of the HMF model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 337(1), pages 36-66.
    • Handle: RePEc:eee:phsmap:v:337:y:2004:i:1:p:36-66
    DOI: 10.1016/j.physa.2004.01.041
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    Citations

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    Cited by:

    1. Atenas, Boris & Curilef, Sergio, 2021. "A statistical description for the Quasi-Stationary-States of the dipole-type Hamiltonian Mean Field Model based on a family of Vlasov solutions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 568(C).
    2. Maciel, J.M. & Firpo, M.-C. & Amato, M.A., 2015. "Some statistical equilibrium mechanics and stability properties of a class of two-dimensional Hamiltonian mean-field models," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 424(C), pages 34-43.
    3. Bouchet, Freddy & Gupta, Shamik & Mukamel, David, 2010. "Thermodynamics and dynamics of systems with long-range interactions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 389(20), pages 4389-4405.
    4. Casetti, Lapo & Kastner, Michael, 2007. "Partial equivalence of statistical ensembles and kinetic energy," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 384(2), pages 318-334.
    5. Chrisment, Antoine M. & Firpo, Marie-Christine, 2016. "Entropy–complexity analysis in some globally-coupled systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 460(C), pages 162-173.
    6. Vesperini, Arthur & Franzosi, Roberto & Ruffo, Stefano & Trombettoni, Andrea & Leoncini, Xavier, 2021. "Fast collective oscillations and clustering phenomena in an antiferromagnetic mean-field model," Chaos, Solitons & Fractals, Elsevier, vol. 153(P2).

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