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arXiv 0811.4267math.PRmath.AP
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碎裂方程解的渐近性态:自相似马尔可夫过程方法

Asymptotic behavior of solutions of the fragmentation equation with shattering: An approach via self-similar Markov processes

Bénédicte Haas

摘要:

本文的主题是一个碎裂方程的非保守性解决方案,一些质量被失去了一个尘埃的零质量粒子作为一个后果,强烈分裂。在碎裂率规则变化的假设下,我们描述了解的大时间行为。我们的方法是基于概率工具:通过非增自相似马尔可夫过程,在有限时间内连续达到0的碎片方程的解决方案。我们的主要概率结果描述了这些过程的渐近行为的条件下不灭绝,然后用于解决方案的碎裂方程。我们注意到有两个参数显著地影响这些大时间行为:“接近1的相对质量”的形成率(该形成率与与相应的自相似马尔可夫过程相关的Lévy测度的接近0的行为有关)和大初始粒子的分布。正确地重新标度,解决方案,然后收敛到一个非平凡的限制,这是有关的拟稳态解的方程。此外,这些拟平稳解,或等价地,自相似马尔可夫过程的拟平稳分布,得到了充分的描述。

英文摘要:

The subject of this paper is a fragmentation equation with nonconservative solutions, some mass being lost to a dust of zero-mass particles as a consequence of an intensive splitting. Under some assumptions of regular variation on the fragmentation rate, we describe the large time behavior of solutions. Our approach is based on probabilistic tools: the solutions to the fragmentation equation are constructed via nonincreasing self-similar Markov processes that continuously reach 0 in finite time. Our main probabilistic result describes the asymptotic behavior of these processes conditioned on nonextinction and is then used for the solutions to the fragmentation equation. We note that two parameters significantly influence these large time behaviors: the rate of formation of "nearly-1 relative masses" (this rate is related to the behavior near 0 of the Lévy measure associated with the corresponding self-similar Markov process) and the distribution of large initial particles. Correctly rescaled, the solutions then converge to a nontrivial limit which is related to the quasi-stationary solutions of the equation. Besides, these quasi-stationary solutions, or, equivalently, the quasi-stationary distributions of the self-similar Markov processes, are fully described.

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