粒子在一组纵波中混沌运动的准线性扩散
Quasilinear diffusion for the chaotic motion of a particle in a set of longitudinal waves
摘要:
对粒子在一组具有随机相位和大振幅(~ A)的纵波中的混沌运动进行了严格的扩散系数解析计算。第一步证明了时间尺度~ A^{-2/3} \ln A上的拟线性扩散的存在性。第二步使用这个属性,通过引入轨道在给定时间的位置和速度的条件概率分布,当它们在前一时间已知时,将结果扩展到渐近时间。
英文摘要:
The rigorous analytical calculation of the diffusion coefficient is performed for the chaotic motion of a particle in a set of longitudinal waves with random phases and large amplitudes (~ A). A first step proves the existence of a quasilinear diffusion on a time scale ~ A^{-2/3} \ln A. A second step uses this property to extend the result to asymptotic times by introducing the conditional probability distribution of position and velocity of an orbit at a given time when they are known at a previous time.
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