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arXiv 1108.5488math.PR
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随机环境中几类最后通过增长模型极限形状的性质(学位论文)

Properties of the limit shape for some last passage growth models in random environments (Dissertation)

Hao Lin

摘要:

本文研究了权值具有一般分布的平面正方形格点上的有向最后通过渗流问题,等价地,研究了具有一般服务分布的串联排队问题。最后一次传代模型的每一行都有自己随机选择的权重分布。我们首先证明了极限时间常数的存在性,并列出了它的性质。接下来,我们研究具有伯努利和指数权重的模型的问题,我们已经有了更精确的结果。然后,我们提出了一些普遍性的结果的极限时间常数接近象限的边界。在接近y轴的地方,平均的广义过程的数量很大,极限时间常数采用与齐次模型相同的泛值型。但在x轴附近,我们看到随机环境分布的尾部效应。特别地,我们将给出这种情况下的上界的一些估计。

英文摘要:

We study directed last-passage percolation on the planar square lattice whose weights have general distributions, or equivalently, queues in series with general service distributions. Each row of the last passage model has its own randomly chosen weight distribution. We first show the existence of the limiting time constant and list its properties. Next we study the problem for models with Bernoulli and exponential weights, for which we already have more precise results. We then present some universality results about the limiting time constant close to the boundary of the quadrant. Close to the y-axis, where the number of random distributions averaged over stays large, the limiting time constant takes the same universal form as in the homogeneous model. But close to the x-axis we see the effect of the tail of the distribution of the random environment. In particular we will give some estimates of the upper bound in this case.

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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