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arXiv 0811.3706math.PRmath-phmath.MP
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TASEP速度过程

The TASEP speed process

Gideon Amir, Omer Angel, Benedek Valkó

摘要:

在直线上的多类型完全不对称简单排它过程(TASEP)中,Z的每个位置都被一个标记了某个数字的粒子占据,如果两个相邻的粒子的标记是递增的,则它们以1的速率交换.考虑具有初始配置的过程,其中每个粒子由其位置标记。据了解,在这种情况下,每个粒子的渐近速度均匀分布在[-1,1]上。我们研究这些速度的联合分布:TASEP速度过程。我们证明了TASEP速度过程是平稳的多类型TASEP动态。因此,每个遍历平稳测度都是速度过程测度的投影。这概括了以前的描述限制到100多个类。通过结合这一结果与已知的平稳措施TASEP与许多类型,我们计算几个边际的速度过程,包括联合密度的两个和三个连续的速度。该分布的一个显著性质是,两个速度相等且具有正概率,并且对于任何给定的粒子,都有无穷多个其他粒子具有相同的速度。我们还研究了部分不对称简单排它过程(ASEP)。我们证明了上述初始配置的ASEP的状态,被视为Z的排列,是对称的分布。这使我们能够扩展我们的一些结果,包括平稳性和描述的所有遍历平稳措施,也ASEP。

英文摘要:

In the multi-type totally asymmetric simple exclusion process (TASEP) on the line, each site of Z is occupied by a particle labeled with some number, and two neighboring particles are interchanged at rate one if their labels are in increasing order. Consider the process with the initial configuration where each particle is labeled by its position. It is known that in this case a.s. each particle has an asymptotic speed which is distributed uniformly on [-1,1]. We study the joint distribution of these speeds: the TASEP speed process. We prove that the TASEP speed process is stationary with respect to the multi-type TASEP dynamics. Consequently, every ergodic stationary measure is given as a projection of the speed process measure. This generalizes previous descriptions restricted to finitely many classes. By combining this result with known stationary measures for TASEPs with finitely many types, we compute several marginals of the speed process, including the joint density of two and three consecutive speeds. One striking property of the distribution is that two speeds are equal with positive probability and for any given particle there are infinitely many others with the same speed. We also study the partially asymmetric simple exclusion process (ASEP). We prove that the states of the ASEP with the above initial configuration, seen as permutations of Z, are symmetric in distribution. This allows us to extend some of our results, including the stationarity and description of all ergodic stationary measures, also to the ASEP.

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