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arXiv 0805.3012math.PRcond-mat.stat-mechmath-phmath.MP
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随机扰动晶格动力学中的能量输运

Energy transport in stochastically perturbed lattice dynamics

Giada Basile, Stefano Olla, Herbert Spohn

摘要:

我们考虑了具有小的随机扰动的晶格动力学,证明了对于\varepsilon \^-1级的时间尺度,局域谱密度(Wigner函数)按照描述非弹性碰撞的线性输运方程演化.对于能量和动量守恒的链,输运方程预测了平衡时能流相关性的缓慢衰减,为1/ \sqrt{t}。这与以前使用不同方法的研究一致。

英文摘要:

We consider lattice dynamics with a small stochastic perturbation of order ε and prove that for a space-time scale of order \varepsilon\^-1 the local spectral density (Wigner function) evolves according to a linear transport equation describing inelastic collisions. For an energy and momentum conserving chain the transport equation predicts a slow decay, as 1/\sqrt{t}, for the energy current correlation in equilibrium. This is in agreement with previous studies using a different method.

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