论文标题

二维不可压缩的极性活性流体的流体动力学理论与淬火和退火障碍

Hydrodynamic theory of two-dimensional incompressible polar active fluids with quenched and annealed disorder

论文作者

Chen, Leiming, Lee, Chiu Fan, Maitra, Ananyo, Toner, John

论文摘要

我们研究了在存在淬火和退火障碍的情况下,二维(2D)不可压缩的极性流体的运动阶段。我们表明,即使在这种缺陷缠绕的二维系统中,远距离极顺序也存在。我们使用三种不同的动态重归其化组方案获得了速度波动的较大距离,长期缩放定律。这些是一个不受控制的一环计算,正好在两个维度上,两个$ d =(d_c-ε)$ - 扩展到$ O(ε)$,通过我们的2D模型的两个不同的分析延续来获得的较高空间维度:a`````'''''''''''''''''''; $ d_c = {5 \ over 2} $。令人惊讶的是,速度相关函数的淬灭和退火部分具有相同的各向异性指数,并且分散关系的松弛和传播部分在非线性理论中具有相同的动态指数,即使它们在线性化理论中是独特的。这是由于异常的流体动力学。此外,所有三个重新归一化方案为通用指数产生非常相似的值,因此,我们期望我们预测的数值非常准确。

We study the moving phase of two-dimensional (2D) incompressible polar active fluids in the presence of both quenched and annealed disorder. We show that long-range polar order persists even in this defect-ridden two-dimensional system. We obtain the large-distance, long-time scaling laws of the velocity fluctuations using three distinct dynamic renormalization group schemes. These are an uncontrolled one-loop calculation in exactly two dimensions, and two $d=(d_c-ε)$-expansions to $O(ε)$, obtained by two different analytic continuations of our 2D model to higher spatial dimensions: a ``hard" continuation which has $d_c={7\over 3}$, and a ``soft" continuation with $d_c={5\over 2}$. Surprisingly, the quenched and annealed parts of the velocity correlation function have the same anisotropy exponent and the relaxational and propagating parts of the dispersion relation have the same dynamic exponent in the nonlinear theory even though they are distinct in the linearized theory. This is due to anomalous hydrodynamics. Furthermore, all three renormalization schemes yield very similar values for the universal exponents, and, therefore, we expect the numerical values we predict for them to be highly accurate.

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