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arXiv 2403.07577hep-th
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平面近似下p=2类玻璃态矩阵的泛函重整化群:I. 平衡态的顶点展开

Functional renormalization group for p=2 like glassy matrices in the planar approximation: I. Vertex expansion at equilibrium

Vincent Lahoche, Dine Ousmane Samary

AI总结:

本文利用泛函重整化群的顶点与导数展开,研究大N极限下含Wigner无序的复随机矩阵平衡态,发现行为良好的不动点解及凝聚相与稀薄相之间的一阶相变证据,并联系动力学相变解释相空间。

摘要:

本文研究一个 $N\ imes N$ 随机复矩阵 $M$ 的平衡态,该矩阵的矩阵元按照包含高斯白噪声和线性无序(由 Wigner 随机矩阵体现)的 Langevin 方程随时间演化。在大 $N$ 极限下,无序表现为有效动力学,我们据此对 Wigner 谱进行粗粒化,并采用两种不同的方案,分别称为主动方案和被动方案。随后,我们利用顶点展开和导数展开研究非微扰重整化群的显式解,这是处理大 $N$ 下有效场论非局域性质的一种简单方法。我们的主要结论是存在行为良好的不动点解,并且至少有部分证据表明在凝聚相和稀薄相之间存在一个不连续(一阶)相变。最后,我们结合与动力学相变相关的非平衡过程对所得到的相空间进行解释。

英文摘要:

In this paper, we study the equilibrium states of a $N\times N$ stochastic complex random matrix $M$, whose entries evolve in time accordingly with a Langevin equation including both Gaussian white noises and a linear disorder, materialized by the Wigner random matrices. In large $N$-limit, the disorders behave as effective kinetics, and we examine a coarse-graining over the Wigner spectrum accordingly with two different schemes that we call respectively active and passive. We then investigate explicit solutions of the nonperturbative renormalization group using vertex and derivative expansion, a simple way to deal with the nonlocal nature of the effective field theory at large $N$. Our main statement is the existence of well-behaved fixed point solutions and at least some evidence about a discontinuous (first order) phase transition between a condensed and a dilute phase. We finally interpret the resulting phase space regarding the out-of-equilibrium process related to the dynamical phase transitions.

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