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arXiv 1209.4650cond-mat.stat-mechhep-th
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定常Kardar-Parisi-Zhang方程的非微扰重整化群:1+1,2+1和3+1维的标度函数和振幅比

Nonperturbative renormalization group for the stationary Kardar-Parisi-Zhang equation: scaling functions and amplitude ratios in 1+1, 2+1 and 3+1 dimensions

Thomas Kloss, Léonie Canet, Nicolás Wschebor

摘要:

我们使用非微扰重整化群(NPRG)方法研究了定态Kardar-Parisi-Zhang方程在尺寸d=1,2,3的衬底上生长界面的强耦合机制.我们计算临界指数,相关性和响应函数,提取相关的标度函数和计算通用振幅比。我们采用了之前工作[PRE 84,061128(2011)和Erratum 86,019904(2012)]中提出的二阶(响应域)近似的简化实现,这大大简化了NPRG流方程的频率部分,同时保持了非平凡的频率依赖性2点函数。在这种方法中得到的一维尺度函数比较非常准确的尺度函数从完整的二阶NPRG方程和精确的尺度函数。此外,该方法是很容易适用于更高的维度,我们提供的标度函数和振幅比在d=2和d=3。我们认为,我们的分析是可靠的d \simeq 3.5。

英文摘要:

We investigate the strong-coupling regime of the stationary Kardar-Parisi-Zhang equation for interfaces growing on a substrate of dimension d=1, 2, and 3 using a nonperturbative renormalization group (NPRG) approach. We compute critical exponents, correlation and response functions, extract the related scaling functions and calculate universal amplitude ratios. We work with a simplified implementation of the second-order (in the response field) approximation proposed in a previous work [PRE 84, 061128 (2011) and Erratum 86, 019904 (2012)], which greatly simplifies the frequency sector of the NPRG flow equations, while keeping a nontrivial frequency dependence for the 2-point functions. The one-dimensional scaling function obtained within this approach compares very accurately with the scaling function obtained from the full second-order NPRG equations and with the exact scaling function. Furthermore, the approach is easily applicable to higher dimensions and we provide scaling functions and amplitude ratios in d=2 and d=3. We argue that our ansatz is reliable up to d \simeq 3.5.

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