二维沙堆表面的两种群模型:渐近粗糙化的情况
A two-species model of a two-dimensional sandpile surface: a case of asymptotic roughening
摘要:
本文提出并分析了一个(2 + 1)维沙堆表面演化模型,其中移动颗粒(ρ(x,t))和不移动团簇(h(x,t))的动力学是耦合的.我们的耦合模型的情况下,沙堆是平的平均,所以没有偏见,由于重力。我们发现反常的缩放:在短的长度和时间尺度上的期望的对数平滑让位于在渐近极限中的粗糙化,其中发现了新的和非平凡的指数。
英文摘要:
We present and analyze a model of an evolving sandpile surface in (2 + 1) dimensions where the dynamics of mobile grains (ρ(x, t)) and immobile clusters (h(x, t)) are coupled. Our coupling models the situation where the sandpile is flat on average, so that there is no bias due to gravity. We find anomalous scaling: the expected logarithmic smoothing at short length and time scales gives way to roughening in the asymptotic limit, where novel and non-trivial exponents are found.
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