Perturbation theory for the Rosenzweig-Porter matrix model

Perturbation theory for the Rosenzweig-Porter matrix model
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Rosenzweig-Porter 矩阵模型的微扰理论

DOI:
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发表时间:
1997
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通讯作者:
B. Shapiro
B. Shapiro
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文献类型:
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作者:
A. Altland;M. Janssen;B. Shapiro

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我们研究的合奏随机矩阵(罗森茨威格-波特模型),与标准的高斯系综,是不是不变的基础下的变化。我们表明,一个相当完整的理解其水平的相关性,可以得到在标准框架内的图形微扰理论。微扰展开的结构允许在简单的物理基础上解释能级结构,这是精确分析中缺少的一个方面[T。Guhr,Phys. Rev. Lett. 76,2258(1996); T. Guhr和A. M“uller-Groeling,J.Math.Phys.38,1870(1997)]。
We study an ensemble of random matrices (the Rosenzweig-Porter model) which, in contrast to the standard Gaussian ensemble, is not invariant under changes of basis. We show that a rather complete understanding of its level correlations can be obtained within the standard framework of diagrammatic perturbation theory. The structure of the perturbation expansion allows for an interpretation of the level structure on simple physical grounds, an aspect that is missing in the exact analysis [T. Guhr, Phys. Rev. Lett. 76, 2258 (1996); T. Guhr and A. M"uller-Groeling, J. Math. Phys. 38, 1870 (1997)].