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arXiv 2103.11250math-phmath.MP
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经典 β-系综的高低温对偶性

High-low temperature dualities for the classical $β$-ensembles

Peter J. Forrester

AI总结:

本文研究经典 β-系综的圈方程,提出固定 N 并按 β 的负幂次展开的新方法,重新导出了 Stieltjes 关于经典多项式零点与对数气体最小能量构型的经典结果,并发现并推广了经典权函数下一点函数及其高阶多点类似物所满足的高低温对偶性。

摘要:

β-系综的圈方程通常通过 1/N 展开求解。我们观察到,也可以固定 N 并按 β 的负幂次展开。在首阶近似下,对于与线性统计量 A = ∑_{j=1}^N 1/(x - λ_j) 的平均值相对应的一点函数 W_1(x),并针对经典权函数进行特殊化处理,这一方法重新得到了 Stieltjes 的著名结果,即经典多项式零点与某些对数气体势能的最小能量构型之间的关系。此外,我们观察到,在经典权函数情形下 W_1(x) 所满足的微分方程——它们是特定的 Riccati 方程——与高温标度极限 β = 2α/N(α 固定,N → ∞)下 W_1(x) 所满足的微分方程之间存在简单联系,这暗示了某种高低温对偶性。进一步证明,这种对偶性的一种推广——无需任何极限过程即可成立——对经典 β-系综中的 W_1(x) 及其所有高阶多点类似物均成立。

英文摘要:

The loop equations for the $β$-ensembles are conventionally solved in terms of a $1/N$ expansion. We observe that it is also possible to fix $N$ and expand in inverse powers of $β$. At leading order, for the one-point function $W_1(x)$ corresponding to the average of the linear statistic $A = \sum_{j=1}^N 1/(x - λ_j)$, and specialising the classical weights, this reclaims well known results of Stieltjes relating the zeros of the classical polynomials to the minimum energy configuration of certain log-gas potential energies. Moreover, it is observed that the differential equations satisfied by $W_1(x)$ in the case of classical weights -- which are particular Riccati equations -- are simply related to the differential equations satisfied by $W_1(x)$ in the high temperature scaled limit $β= 2α/N$ ($α$ fixed, $N \to \infty$), implying a certain high-low temperature duality. A generalisation of this duality, valid without any limiting procedure, is shown to hold for $W_1(x)$ and all its higher point analogues in the classical $β$-ensembles.

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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