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arXiv 2407.08593hep-thmath-phmath.MP
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矩阵模型的解析轨迹引导法

Analytic trajectory bootstrap for matrix models

Wenliang Li

AI总结:

该研究通过解析轨迹引导法重新研究大N双矩阵模型,提出奇点结构假设并结合环路方程约束,以低计算成本获得高精度解,还分析了本征值分布及对称破缺解。

摘要:

我们通过解析轨迹引导法重新研究了具有tr[A,B]^2相互作用和四次势的大N双矩阵模型,其中A和B代表两个矩阵。在大N极限下,我们可聚焦于与由字母A和B组成的单词相关的单迹矩。单词及子单词长度的解析延拓导致单迹矩的解析轨迹,以及不同轨迹间有趣的交点。受单矩阵模型单割线解的启发,我们为双矩阵生成函数和相应单迹矩的奇点结构提出了一些简单假设。结合来自环路方程的自洽约束,我们确定了假设中的自由参数,并以较低计算成本获得了双矩阵模型的高精度解。对于给定的长度截断L_max,我们的结果在松弛法的正性边界内且更精确,例如L_max=18时约有6位数字精度。收敛模式表明L_max=22时我们可达到约8位数字精度。由于奇点结构与本征值分布密切相关,我们进一步给出了各种本征值密度的结果。最后,我们使用更复杂的假设研究了对称破缺解。

英文摘要:

We revisit the large $N$ two-matrix model with $\text{tr}[A,B]^2$ interaction and quartic potentials by the analytic trajectory bootstrap, where $A$ and $B$ represent the two matrices. In the large $N$ limit, we can focus on the single trace moments associated with the words composed of the letters $A$ and $B$. Analytic continuations in the lengths of the words and subwords lead to analytic trajectories of single trace moments and intriguing intersections of different trajectories. Inspired by the one-cut solutions of one-matrix models, we propose some simple ansatzes for the singularity structure of the two-matrix generating functions and the corresponding single trace moments. Together with the self-consistent constraints from the loop equations, we determine the free parameters in the ansatzes and obtain highly accurate solutions for the two-matrix model at a low computational cost. For a given length cutoff $L_\text{max}$, our results are within and more accurate than the positivity bounds from the relaxation method, such as about 6-digit accuracy for $L_\text{max}=18$. The convergence pattern suggests that we achieve about $8$-digit accuracy for $L_\text{max}=22$. As the singularity structure is closely related to the eigenvalue distributions, we further present the results for various types of eigenvalue densities. In the end, we study the symmetry breaking solutions using more complicated ansatzes.

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