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arXiv math/0406392math.PR
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水平交叉概率I:一维随机游动与对称化

Level Crossing Probabilities I: One-dimensional Random Walks and Symmetrization

Rainer Siegmund-Schultze, Heinrich von Weizsaecker

摘要:

我们证明了对于任意一维的具有独立增量的随机游动,在给定的时间n穿越一个水平的概率具有n的平方根的数量级。力矩或对称性假设是不必要的。在去除对称性时,(尖锐的)不等式P(|X+Y| <= 1)< 2 P(|X-Y| <= 1)对于独立同分布的X,使用Y。在第二部分中,我们将讨论这个结果与高维游动的“多边形递归”以及Mauldin,Monticino和v.Weizsaecker [5]意义下的定向随机游动的一些结果的联系。

英文摘要:

We prove for an arbitrary one-dimensional random walk with independent increments that the probability of crossing a level at a given time n has the order of square root of n. Moment or symmetry assumptions are not necessary. In removing symmetry the (sharp) inequality P(|X+Y| <= 1) < 2 P(|X-Y| <= 1) for independent identically distributed X,Y is used. In part II we shall discuss the connection of this result to 'polygonal recurrence' of higher-dimensional walks and some conjectures on directionally random walks in the sense of Mauldin, Monticino and v.Weizsaecker [5].

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