Anomalous Energy Transport in FPU- Chain

作者：Mellet Antoine^*; Merino Aceituno Sara

来源：Journal of Statistical Physics, 2015, 160(3): 583-621.

DOI：10.1007/s10955-015-1273-2

• FPU-beta chain
• Boltzmann phonon equation
• Hydrodynamic limit
• Anomalous diffusion

This paper is devoted to the derivation of a macroscopic fractional diffusion equation describing heat transport in an anharmonic chain. More precisely, we study here the so-called FPU- chain, which is a very simple model for a one-dimensional crystal in which atoms are coupled to their nearest neighbors by a harmonic potential, weakly perturbed by a quartic potential. The starting point of our mathematical analysis is a kinetic equation: Lattice vibrations, responsible for heat transport, are modeled by an interacting gas of phonons whose evolution is described by the Boltzmann phonon equation. Our main result is the rigorous derivation of an anomalous diffusion equation starting from the linearized Boltzmann phonon equation.

• 出版日期2015-8