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arXiv 1008.0144math.PRcond-mat.stat-mechmath-phmath.MPnlin.SI
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非碰撞平方贝塞尔过程

Noncolliding Squared Bessel Processes

Makoto Katori, Hideki Tanemura

摘要:

本文考虑一个由平方贝塞尔过程构成的粒子系统,其指标为$ν> -1$,条件是不相互碰撞,其中如果满足$-1 < ν< 0$,则假定原点是反射的.当粒子的数量是有限的,我们证明了任何固定的初始配置,这个非碰撞扩散过程是行列式的意义上,任何多时间相关函数是由一个连续的内核称为相关内核的行列式。当粒子数为无穷大时,我们给出了初始组态的充分条件,使系统是好定义的。在那里,具有无穷多个粒子的过程是决定性的,并且相关核使用由Weierstrass典范乘积表示的整函数来表示,其在实轴的正部分上的零点由初始配置中的粒子位置给出。从满足我们条件的无穷粒子初始组态类中,我们详细地给出了一个例子,它是一个固定组态,使得贝塞尔函数$J_ν$的正零点的平方的每一点都被一个粒子占据.从这个初始配置开始的过程显示出收敛到平稳过程的弛豫现象,该平稳过程在长期极限下与扩展的Bessel核是行列式的。

英文摘要:

We consider a particle system of the squared Bessel processes with index $ν> -1$ conditioned never to collide with each other, in which if $-1 < ν< 0$ the origin is assumed to be reflecting. When the number of particles is finite, we prove for any fixed initial configuration that this noncolliding diffusion process is determinantal in the sense that any multitime correlation function is given by a determinant with a continuous kernel called the correlation kernel. When the number of particles is infinite, we give sufficient conditions for initial configurations so that the system is well defined. There the process with an infinite number of particles is determinantal and the correlation kernel is expressed using an entire function represented by the Weierstrass canonical product, whose zeros on the positive part of the real axis are given by the particle-positions in the initial configuration. From the class of infinite-particle initial configurations satisfying our conditions, we report one example in detail, which is a fixed configuration such that every point of the square of positive zero of the Bessel function $J_ν$ is occupied by one particle. The process starting from this initial configuration shows a relaxation phenomenon converging to the stationary process, which is determinantal with the extended Bessel kernel, in the long-term limit.

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