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arXiv 1202.1658cond-mat.stat-mech
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非临界SLE耗散阿贝尔沙堆模型中的雪崩边界(2)

Avalanche frontiers in dissipative abelian sandpile model as off-critical SLE(2)

M. N. Najafi, Saman Moghimi-Araghi, S. Rouhani

摘要:

阿贝尔沙堆模型(ASM)中的雪崩边界是随机的简单曲线,其连续极限是具有扩散系数$κ= 2$的Schramm-Loewner演化(SLE)。在本文中,我们考虑耗散ASM和研究的统计雪崩和波前沿的各种率的耗散。我们研究了一些函数的标度行为,如相关长度,指数的循环长度和回转半径定义的波和雪崩的分布函数。我们发现,它们确实与耗散率成比例。观察到两个显著的长度尺度。对于远小于相关长度的长度尺度,这些曲线显示出接近临界曲线的特性,并且相应的扩散系数参数与临界极限几乎相同。我们将其解释为紫外(UV)限度,其中$κ= 2$对应于$c=-2$。当长度尺度远大于关联长度时,雪崩前沿趋向于自回避行走,相应的驱动函数与布朗运动成正比,扩散参数为$κ=8/3$,对应于$c = 0$的场论.这就是红外线(IR)极限。相应地,中心荷从IR点到UV点减小。

英文摘要:

Avalanche frontiers in Abelian Sandpile Model (ASM) are random simple curves whose continuum limit is known to be a Schramm-Loewner Evolution (SLE) with diffusivity parameter $κ= 2$. In this paper we consider the dissipative ASM and study the statistics of the avalanche and wave frontiers for various rates of dissipation. We examine the scaling behavior of a number of functions such as the correlation length, the exponent of distribution function of loop lengths and gyration radius defined for waves and avalanches. We find that they do scale with the rate of dissipation. Two significant length scales are observed. For length scales much smaller than the correlation length, these curves show properties close to the critical curves and the corresponding diffusivity parameter is nearly the same as the critical limit. We interpret this as the ultra violet (UV) limit where $κ= 2$ corresponding to $c=-2$. For length scales much larger than the correlation length we find that the avalanche frontiers tend to Self-Avoiding Walk, the corresponding driving function is proportional to the Brownian motion with the diffusion parameter $κ=8/3$ corresponding to a field theory with $c = 0$. This is the infra red (IR) limit. Correspondingly the central charge decreases from the IR to the UV point.

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