Phase transition in the collisionless regime for wave-particle interaction

Details Phase transition in the collisionless regime for wave-particle interaction Phase transition in the collisionless regime for wave-particle interaction

2000-12-21

arxiv.org/abs/physics/0012053v1

Phys. Rev. Lett. 84 (2000) 3318-3321

Physics

Plasma Physics

12 pages (RevTeX), 2 figures (PostScript)

Scientific paper

10.1103/PhysRevLett.84.3318

Gibbs statistical mechanics is derived for the Hamiltonian system coupling self-consistently a wave to N particles. This identifies Landau damping with a regime where a second order phase transition occurs. For nonequilibrium initial data with warm particles, a critical initial wave intensity is found: above it, thermodynamics predicts a finite wave amplitude in the limit of infinite N; below it, the equilibrium amplitude vanishes. Simulations support these predictions providing new insight on the long-time nonlinear fate of the wave due to Landau damping in plasmas.

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