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arXiv 2402.11233math-phmath.MPnlin.SI
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修正Bessel函数行列式的渐近行为与第二Painlevé方程

Asymptotics of the determinant of the modified Bessel functions and the second Painlevé equation

Yu Chen, Shuai-Xia Xu, Yu-Qiu Zhao

AI总结:

本文通过引入对数项研究扩展Gross-Witten-Wadia酉矩阵模型,利用Deift-Zhou非线性最速下降法求解Riemann-Hilbert问题,建立了Toeplitz行列式的渐近近似,并与非齐次Painlevé II方程的解相联系。

摘要:

本文通过在势能中引入对数项,考虑了扩展的Gross-Witten-Wadia酉矩阵模型。该模型的配分函数可以等价地用Toeplitz行列式表示,其$(i,j)$项为阶数为$i-j-\nu$的修正Bessel函数,其中$\nu\in\mathbb{C}$。当度$n$有限时,我们证明了Toeplitz行列式可由Painlevé III方程的等单值$\tau$-函数描述。作为双重尺度极限,我们建立了Toeplitz行列式对数导数的渐近近似,该近似由带有参数$\nu+\frac{1}{2}$的非齐次Painlevé II方程的Hastings-McLeod解表示。此外,还推导了相关正交多项式的首项系数和递推系数的渐近行为。我们通过将Deift-Zhou非线性最速下降法应用于Hankel回路上正交多项式的Riemann-Hilbert问题得出了这些结果。此处的关键是在临界点$z=-1$处构建局部参数矩阵,其中涉及非齐次Painlevé II方程的Jimbo-Miwa Lax对的$\psi$-函数。

英文摘要:

In the paper, we consider the extended Gross-Witten-Wadia unitary matrix model by introducing a logarithmic term in the potential. The partition function of the model can be expressed equivalently in terms of the Toeplitz determinant with the $(i,j)$-entry being the modified Bessel functions of order $i-j-ν$, $ν\in\mathbb{C}$. When the degree $n$ is finite, we show that the Toeplitz determinant is described by the isomonodromy $τ$-function of the Painlevé III equation. As a double scaling limit, %In the double scaling limit as the degree $n\to\infty$, we establish an asymptotic approximation of the logarithmic derivative of the Toeplitz determinant, expressed in terms of the Hastings-McLeod solution of the inhomogeneous Painlevé II equation with parameter $ν+\frac{1}{2}$. The asymptotics of the leading coefficient and recurrence coefficient of the associated orthogonal polynomials are also derived. We obtain the results by applying the Deift-Zhou nonlinear steepest descent method to the Riemann-Hilbert problem for orthogonal polynomials on the Hankel loop. The main concern here is the construction of a local parametrix at the critical point $z=-1$, where the $ψ$-function of the Jimbo-Miwa Lax pair for the inhomogeneous Painlevé II equation is involved.

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