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arXiv 0905.3636math.PR
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具有无界漂移的一维杀死扩散的拟定常分布的逼近

Approximation of quasi-stationary distributions for 1-dimensional killed diffusions with unbounded drifts

Denis Villemonais

摘要:

被吸收的马尔可夫过程的长时间行为可以用过程的极限分布很好地描述,当它被观察时,过程的条件是不被杀死。我们的目的是给出一个近似的方法,当该过程是一个一维伊藤扩散,其漂移被允许在边界处爆炸。在第一步中,我们展示了如何限制研究的情况下,扩散值在有界区间和其漂移有界。在第二步中,我们展示了一种近似方法的限制条件分布的扩散,基于Fleming-Viot型相互作用粒子系统。我们结束了两个数值应用文件:逻辑费勒扩散和赖特-费舍尔扩散值在$]0,1[$条件被杀死在0。

英文摘要:

The long time behavior of an absorbed Markov process is well described by the limiting distribution of the process conditioned to not be killed when it is observed. Our aim is to give an approximation's method of this limit, when the process is a 1-dimensional Itô diffusion whose drift is allowed to explode at the boundary. In a first step, we show how to restrict the study to the case of a diffusion with values in a bounded interval and whose drift is bounded. In a second step, we show an approximation method of the limiting conditional distribution of such diffusions, based on a Fleming-Viot type interacting particle system. We end the paper with two numerical applications : to the logistic Feller diffusion and to the Wright-Fisher diffusion with values in $]0,1[$ conditioned to be killed at 0.

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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