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arXiv 1503.05339math.PRmath-phmath.MP
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具有显式平稳测度的(2+1)维增长过程

A (2+1)-dimensional growth process with explicit stationary measures

Fabio Lucio Toninelli

摘要:

引入了一类(2+1)维随机增长过程,它可以看作是离散界面的不可逆随机动力学。“不可逆”意味着界面具有平均非零漂移。界面构型对应于无限六边形或正方形晶格的二聚体覆盖的高度函数。该模型也可以被看作是一个相互作用的驱动粒子系统,在完全不对称的情况下,动态对应于一个相互作用的Hammersley过程的无限集合。当动力学不对称性参数$(p-q)$等于零时,无限体积吉布斯测度$π_ρ$(具有给定的斜率$ρ$)是稳定的和可逆的。当$p\ne q$、$π_ρ$不再可逆时,但值得注意的是,它们仍然是稳定的。在这样的平稳状态下,我们发现,在任何给定的点$x$的平均高度函数随时间线性增长$t$与非零的速度:$\mathbb E Q_x(t):=\mathbb E(h_x(t)-h_x(0))= V(ρ) t$,而典型的波动$Q_x(t)$小于任何功率的$t$为$t\to\infty$。在$p=0,q=1$完全不对称的情况下,在六方晶格上,动力学符合A.鲍罗丁和P.L.法拉利对于一个合适的选择,“可积”,初始条件(这是非常远离稳态),他们能够确定流体动力学限制和CLT的界面波动规模$\sqrt{\log t}$,利用事实,在这种情况下,某些时空高度相关性可以精确计算。

英文摘要:

We introduce a class of (2+1)-dimensional stochastic growth processes, that can be seen as irreversible random dynamics of discrete interfaces. "Irreversible" means that the interface has an average non-zero drift. Interface configurations correspond to height functions of dimer coverings of the infinite hexagonal or square lattice. The model can also be viewed as an interacting driven particle system and in the totally asymmetric case the dynamics corresponds to an infinite collection of mutually interacting Hammersley processes. When the dynamical asymmetry parameter $(p-q)$ equals zero, the infinite-volume Gibbs measures $π_ρ$ (with given slope $ρ$) are stationary and reversible. When $p\ne q$, $π_ρ$ are not reversible any more but, remarkably, they are still stationary. In such stationary states, we find that the average height function at any given point $x$ grows linearly with time $t$ with a non-zero speed: $\mathbb E Q_x(t):=\mathbb E(h_x(t)-h_x(0))= V(ρ) t$ while the typical fluctuations of $Q_x(t)$ are smaller than any power of $t$ as $t\to\infty$. In the totally asymmetric case of $p=0,q=1$ and on the hexagonal lattice, the dynamics coincides with the "anisotropic KPZ growth model" introduced by A. Borodin and P. L. Ferrari. For a suitably chosen, "integrable", initial condition (that is very far from the stationary state), they were able to determine the hydrodynamic limit and a CLT for interface fluctuations on scale $\sqrt{\log t}$, exploiting the fact that in that case certain space-time height correlations can be computed exactly.

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