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arXiv 0908.1083math.PR
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杀死分支随机游动中的总子代

Total progeny in killed branching random walk

Louigi Addario-Berry, Nicolas Broutin

摘要:

本文考虑一个分支随机游动,其中第n代粒子的最大位置M_n在线性标度上的速度为零:M_n/n -> 0当n ->无穷大时.我们进一步移除(“杀死”)任何位移为负的粒子及其整个下降。未被杀死的粒子集的大小$Z$几乎肯定是有限的。本文证明了Aldous的一个猜想:当Exp [Zlog Z]=无穷大时,Exp [Z] <无穷大.证明依赖于精确的大偏差估计和投票定理式的结果的样本路径的随机游动。

英文摘要:

We consider a branching random walk for which the maximum position of a particle in the n'th generation, M_n, has zero speed on the linear scale: M_n/n --> 0 as n --> infinity. We further remove ("kill") any particle whose displacement is negative, together with its entire descendence. The size $Z$ of the set of un-killed particles is almost surely finite. In this paper, we confirm a conjecture of Aldous that Exp[Z] < infinity while Exp[Z log Z]=infinity. The proofs rely on precise large deviations estimates and ballot theorem-style results for the sample paths of random walks.

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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