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arXiv math/0610242math.PR
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半空间上反射随机游动的Martin边界

Martin boundary of a reflected random walk on a half-space

Irina Ignatiouk-Robert

摘要:

得到了半空间$\Z^d\times\N$上反射随机游动的Martin紧化的完全表示.证明了完全Martin紧化一般不同胚于Ney和Spitzer对$\Z^d$中的齐次随机游动所得到的“径向”紧化:点序列$z_n\in\Z^{d-1}\times\N$收敛于Martin边界上的点并不意味着序列$z_n/|z_n|$收敛于单位球面$S^d$ .我们的方法依赖于缩放过程的大偏差属性,并使用Pascal的方法结合比率极限定理。非径向极限的存在与非线性最优大偏差轨迹有关。

英文摘要:

The complete representation of the Martin compactification for reflected random walks on a half-space $\Z^d\times\N$ is obtained. It is shown that the full Martin compactification is in general not homeomorphic to the ``radial'' compactification obtained by Ney and Spitzer for the homogeneous random walks in $\Z^d$ : convergence of a sequence of points $z_n\in\Z^{d-1}\times\N$ to a point of on the Martin boundary does not imply convergence of the sequence $z_n/|z_n|$ on the unit sphere $S^d$. Our approach relies on the large deviation properties of the scaled processes and uses Pascal's method combined with the ratio limit theorem. The existence of non-radial limits is related to non-linear optimal large deviation trajectories.

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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