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arXiv math-ph/0301042math-phcond-mat.stat-mechmath.MP
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Dirichlet和Neumann边界条件下的随机矩阵平均和不可穿透玻色气体

Random matrix averages and the impenetrable Bose gas in Dirichlet and Neumann boundary conditions

P. J. Forrester, N. E. Frankel, T. M. Garoni

摘要:

在Dirichlet和Neumann边界条件下,不可穿透玻色气体的密度矩阵可以写成$<\prod_{l=1}^n| \cosϕ_1-\cosθ_l| |\cosϕ_2-\cosθ_l|>$,其中平均值分别相对于经典群$Sp(n)$和$O^+(2n)$的随机酉矩阵的本征值概率密度函数。在大$n$极限中,对数气体考虑意味着平均值分解为$<\prod_{l=1}^n|\cosϕ-\cosθ_l>$形式的平均值的乘积。通过改变变量,该平均值又是通过对来自随机矩阵理论的Jacobi酉系综上的$\prod_{l=1}^n| t-x_l|^{2q}$求平均而获得的$t$的函数的特殊情况。后者的任务是完成的对偶公式从Selberg相关积分理论,并获得大的$n$渐近形式。利用密度矩阵相应的大$n$渐近形式,通过一个特殊积分方程的精确解,计算出与$\sqrt{N}$成正比的低位有效单粒子态及其占据的渐近形式.

英文摘要:

The density matrix for the impenetrable Bose gas in Dirichlet and Neumann boundary conditions can be written in terms of $<\prod_{l=1}^n| \cosϕ_1-\cosθ_l| |\cosϕ_2-\cosθ_l|>$, where the average is with respect to the eigenvalue probability density function for random unitary matrices from the classical groups $Sp(n)$ and $O^+(2n)$ respectively. In the large $n$ limit log-gas considerations imply that the average factorizes into the product of averages of the form $<\prod_{l=1}^n|\cosϕ-\cosθ_l>$. By changing variables this average in turn is a special case of the function of $t$ obtained by averaging $\prod_{l=1}^n| t-x_l|^{2q}$ over the Jacobi unitary ensemble from random matrix theory. The latter task is accomplished by a duality formula from the theory of Selberg correlation integrals, and the large $n$ asymptotic form is obtained. The corresponding large $n$ asymptotic form of the density matrix is used, via the exact solution of a particular integral equation, to compute the asymptotic form of the low lying effective single particle states and their occupations, which are proportional to $\sqrt{N}$.

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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