Local stationarity for lattice dynamics in the harmonic approximation

Details Local stationarity for lattice dynamics in the harmonic approximation Local stationarity for lattice dynamics in the harmonic approximation

2005-05-10

arxiv.org/abs/math-ph/0505031v1

Physics

Mathematical Physics

Scientific paper

We consider the lattice dynamics in the harmonic approximation for We consider the lattice dynamics in the harmonic approximation for a simple hypercubic lattice with arbitrary unit cell. The initial data are random according to a probability measure which enforces slow spatial variation on the linear scale $\epsilon^{-1}$. We establish two time regimes. For times of order $\epsilon^{-\gamma}$, $0<\gamma<1$, locally the measure converges to a Gaussian measure which is space-time stationary with a covariance inherited from the initial (in general, non-Gaussian) measure. For times of order $\epsilon^{-1}$ this local space covariance changes in time and is governed by a semiclassical transport equation.

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