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arXiv 1708.06006math.PR
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KPZ不动点的遍历性

Ergodicity of the KPZ Fixed Point

Leandro P. R. Pimentel

摘要:

Kardar-Parisi-Zhang(KPZ)不动点是最近由Matetski,Quastel,Remenik(arXiv:1701.00018)提出的一个马尔可夫过程,它描述了与完全不对称简单排它过程(TASEP)相关的高度函数的极限波动,并且它被证明是KPZ普适类的中心。我们的主要结果是,KPZ增量过程弱收敛到它的不变测度,给出了一个双边布朗运动零漂移和扩散系数2。证明的核心是耦合方法,该方法允许我们将TASEP高度函数与其不变过程进行比较,该过程在KPZ缩放下变成KPZ不动点的均匀估计。

英文摘要:

The Kardar-Parisi-Zhang (KPZ) fixed point is a Markov process, recently introduced by Matetski, Quastel, Remenik (arXiv:1701.00018), that describes the limit fluctuations of the height function associated to the totally asymmetric simple exclusion process (TASEP), and it is conjectured to be at the centre of the KPZ universality class. Our main result is that the KPZ incremental process converges weakly to its invariant measure, given by a two-sided Brownian motion with zero drift and diffusion coefficient 2. The heart of the proof is the coupling method that allows us to compare the TASEP height function with its invariant process, which under the KPZ scaling turns into uniform estimates for the KPZ fixed point.

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