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arXiv 0808.3635cond-mat.stat-mechcond-mat.softmath-phmath.MP
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非碰撞布朗路桥的最大分布

Maximum distributions of bridges of noncolliding Brownian paths

Naoki Kobayashi, Minami Izumi, Makoto Katori

摘要:

一维布朗运动在时间$t=0$从原点开始,在时间$t=1$返回原点,并在时间间隔$0 < t < 1$内保持正值,称为持续时间为1的贝塞尔桥。我们考虑的$N$ -粒子系统的贝塞尔桥的条件永远不会相互碰撞在$0 < t < 1$,这是连续极限的恶性行走模型的西瓜配置与墙。研究了在时间间隔$t \in (0,1)$内到达的路径的最大值的分布,以表征时空平面上排斥路径的随机模式的统计特性。对于一般的$N$,对于最外路径,精确地确定了最大值的分布函数。我们证明了非碰撞Bessel桥的$N$ -路系统可以实现为对称类C中的$2N \times 2N$矩阵值布朗桥的正本征值过程。利用这一事实进行计算机模拟和数值结果的$N$依赖的内部路径的最大值分布的报告。本文的工作表明,非碰撞路的极值问题与随机矩阵理论、对称表示理论和数论有关。

英文摘要:

The one-dimensional Brownian motion starting from the origin at time $t=0$, conditioned to return to the origin at time $t=1$ and to stay positive during time interval $0 < t < 1$, is called the Bessel bridge with duration 1. We consider the $N$-particle system of such Bessel bridges conditioned never to collide with each other in $0 < t < 1$, which is the continuum limit of the vicious walk model in watermelon configuration with a wall. Distributions of maximum-values of paths attained in the time interval $t \in (0,1)$ are studied to characterize the statistics of random patterns of the repulsive paths on the spatio-temporal plane. For the outermost path, the distribution function of maximum value is exactly determined for general $N$. We show that the present $N$-path system of noncolliding Bessel bridges is realized as the positive-eigenvalue process of the $2N \times 2N$ matrix-valued Brownian bridge in the symmetry class C. Using this fact computer simulations are performed and numerical results on the $N$-dependence of the maximum-value distributions of the inner paths are reported. The present work demonstrates that the extreme-value problems of noncolliding paths are related with the random matrix theory, representation theory of symmetry, and the number theory.

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