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arXiv 1703.04596math-phcond-mat.stat-mechmath.MPnlin.SI
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弱非对称排斥过程谱隙的微扰解

Perturbative solution for the spectral gap of the weakly asymmetric exclusion process

Sylvain Prolhac

摘要:

我们考虑了$N=L/2$粒子在$L$格点的周期晶格上的弱非对称排斥过程,并分别考虑了前向和后向的跳跃率$1$和$q=1-μ/\sqrt{L}$.利用Bethe近似,通过逐阶求解一个简单的函数方程,得到了$μ=0$附近谱隙的系统微扰展开式。一个关键点是,当$μ\to0$,贝特根在一个距离$1/\sqrt{L}$的费米海的边缘不应被视为一个连续体,而是收敛到大$L$的复零点$1+\mathrm{erf}(x)$后,重新缩放由$\sqrt{L}$。

英文摘要:

We consider the weakly asymmetric exclusion process with $N=L/2$ particles on a periodic lattice of $L$ sites, and hopping rates $1$ and $q=1-μ/\sqrt{L}$ respectively in the forward and in the backward direction. Using Bethe ansatz, we obtain a systematic perturbative expansion of the spectral gap near $μ=0$ by solving order by order a simple functional equation. A key point is that when $μ\to0$, Bethe roots at a distance $1/\sqrt{L}$ from the edge of the Fermi sea should not be considered as a continuum, but converge instead at large $L$ to the complex zeroes of $1+\mathrm{erf}(x)$ after a rescaling by $\sqrt{L}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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