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arXiv 1003.5527math.PRmath-phmath.MP
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一维动力学模型中的自相似解:概率观点

Self-similar solutions in one-dimensional kinetic models: A probabilistic view

Federico Bassetti, Lucia Ladelli

摘要:

本文讨论了一类实数线上的玻尔兹曼方程,它是著名的Kac漫画的推广。相应方程的一个显著特征是,其中,碰撞增益算子由N-线性平滑变换定义。Bobylev、Cercignani和Gamba最近的一篇论文[Comm.Math.Phys.291(2009)599-644]从本质上分析的观点研究了这类问题。相反,目前的工作完全依赖于概率的方法,基于技术有关的经典中心极限问题和所谓的不动点方程的概率分布。从概率论的方法诉诸的一个优点是,相同的结果-相对于自相似的解决方案-所获得的Bobylev,Cercignani和Gamba,在这里推导出较弱的条件下。特别是,它示出了如何收敛到自相似的解决方案取决于归属的初始数据的吸引区域的一个特定的稳定分布。此外,还利用概率测度之间的Kantorovich-Wasserstein距离和Zolotarev距离给出了收敛速度的一些结果.

英文摘要:

This paper deals with a class of Boltzmann equations on the real line, extensions of the well-known Kac caricature. A distinguishing feature of the corresponding equations is that therein, the collision gain operators are defined by N-linear smoothing transformations. These kind of problems have been studied, from an essentially analytic viewpoint, in a recent paper by Bobylev, Cercignani and Gamba [Comm. Math. Phys. 291 (2009) 599-644]. Instead, the present work rests exclusively on probabilistic methods, based on techniques pertaining to the classical central limit problem and to the so-called fixed-point equations for probability distributions. An advantage of resorting to methods from the probability theory is that the same results - relative to self-similar solutions - as those obtained by Bobylev, Cercignani and Gamba, are here deduced under weaker conditions. In particular, it is shown how convergence to a self-similar solution depends on the belonging of the initial datum to the domain of attraction of a specific stable distribution. Moreover, some results on the speed of convergence are given in terms of Kantorovich-Wasserstein and Zolotarev distances between probability measures.

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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