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arXiv 0906.1395cond-mat.stat-mech
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乘法Lévy过程:伊藤与Stratonovich解释

Multiplicative Lévy processes: Itô versus Stratonovich interpretation

Tomasz Srokowski

摘要:

考虑了带乘性随机力的朗之万方程。这种力是不相关的,它具有列维分布和幂律强度。Fokker-Planck方程,这对应于伊藤和Stratonovich解释的随机积分,提出。他们解决的情况下,没有漂移和谐振子的潜力。对方差进行评估;对于伊藤情况,它总是无限的,而对于Stratonovich情况,它可以是有限的,并且随着时间的增长比线性增长慢,这表明了次扩散。分析结果与数值模拟进行了比较。

英文摘要:

Langevin equation with a multiplicative stochastic force is considered. That force is uncorrelated, it has the Lévy distribution and the power-law intensity. The Fokker-Planck equations, which correspond both to the Itô and Stratonovich interpretation of the stochastic integral, are presented. They are solved for the case without drift and for the harmonic oscillator potential. The variance is evaluated; it is always infinite for the Itô case whereas for the Stratonovich one it can be finite and rise with time slower that linearly, which indicates subdiffusion. Analytical results are compared with numerical simulations.

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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