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arXiv 1908.10892cond-mat.stat-mech
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线性界面生长中的几何相关性

Geometry dependence in linear interface growth

I. S. S. Carrasco, T. J. Oliveira

摘要:

近年来,在界面生长的\textit{nonlinear}普适性类的统计中几何形状的影响已被广泛研究,并且众所周知,产生将它们分成子类的分裂。在这项工作中,我们调查这\textit{linear}类的爱德华-威尔金森(EW)和Mullins-Herring(MH)在一维和二维。从属于这些类的几个离散模型,以及数值积分的生长方程在基板上的固定尺寸(平面几何)或线性扩展的时间(径向几何)的分析结果与广泛的数值模拟的比较,我们验证的高度分布(HD),空间和时间的协方差是普遍的,但几何形状相关。事实上,HD总是高斯的,并且当根据所谓的“KPZ对应”$[h \simeq v_{\infty} t + (Γt)^β χ]$来定义时,它们的概率密度函数$P(χ)$具有均值为零,因此它们的所有累积量都为零,除了它们的方差,其在平坦和径向情况下假定不同的值。的(重新缩放)协方差曲线的形状进行了详细分析,并与一些现有的分析结果进行了比较。总体而言,这些结果表明,这样的大学类的分裂是相当普遍的,不限于非线性的。

英文摘要:

The effect of geometry in the statistics of \textit{nonlinear} universality classes for interface growth has been widely investigated in recent years and it is well known to yield a split of them into subclasses. In this work, we investigate this for the \textit{linear} classes of Edwards-Wilkinson (EW) and of Mullins-Herring (MH) in one- and two-dimensions. From comparison of analytical results with extensive numerical simulations of several discrete models belonging to these classes, as well as numerical integrations of the growth equations on substrates of fixed size (flat geometry) or expanding linearly in time (radial geometry), we verify that the height distributions (HDs), the spatial and the temporal covariances are universal, but geometry-dependent. In fact, the HDs are always Gaussian and, when defined in terms of the so-called "KPZ ansatz" $[h \simeq v_{\infty} t + (Γt)^β χ]$, their probability density functions $P(χ)$ have mean null, so that all their cumulants are null, except by their variances, which assume different values in the flat and radial cases. The shape of the (rescaled) covariance curves is analyzed in detail and compared with some existing analytical results for them. Overall, these results demonstrate that the splitting of such university classes is quite general, being not restricted to the nonlinear ones.

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