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arXiv math-ph/0505082math-phmath.DSmath.MP
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弱随机哈密顿流中的扩散

Diffusion in a weakly random Hamiltonian flow

T. Komorowski, L. Ryzhik

摘要:

我们考虑弱随机哈密顿流所支配的粒子运动。我们确定时间和空间尺度上的粒子轨迹收敛到一个空间布朗运动。证明中的主要技术问题是获得随机加速问题的解收敛到动量扩散的误差估计。我们也将我们的结果应用到随机几何声学方程系统,并表明声波的能量密度经历了空间扩散。

英文摘要:

We consider the motion of a particle governed by a weakly random Hamiltonian flow. We identify temporal and spatial scales on which the particle trajectory converges to a spatial Brownian motion. The main technical issue in the proof is to obtain error estimates for the convergence of the solution of the stochastic acceleration problem to a momentum diffusion. We also apply our results to the system of random geometric acoustics equations and show that the energy density of the acoustic waves undergoes a spatial diffusion.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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