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arXiv 1208.6430math-phcond-mat.dis-nncond-mat.stat-mechmath.MP
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随机$2\times2$矩阵乘积的李雅普诺夫指数与恒等式的接近

The Lyapunov exponent of products of random $2\times2$ matrices close to the identity

A. Comtet, J. M. Luck, C. Texier, Y. Tourigny

摘要:

我们研究了任意随机实$2 \times 2$矩阵的乘积,这些矩阵与单位矩阵非常接近。使用岩泽分解的$\text{SL}(2,{\mathbb R})$,我们确定了一个连续制度的平均值和协方差的三个岩泽参数同时小。在此制度下,产品的李雅普诺夫指数所示,采取缩放形式。在一般情况下,相应的尺度函数表示为高斯超几何函数。一些特殊的情况下,也被认为是,其中的尺度函数的李雅普诺夫指数涉及其他特殊功能(艾里,贝塞尔,惠特克,椭圆)。这样得到的一般解使我们能够在一个统一的框架中恢复以前从一维无序系统的精确可解模型中得到的许多结果。

英文摘要:

We study products of arbitrary random real $2 \times 2$ matrices that are close to the identity matrix. Using the Iwasawa decomposition of $\text{SL}(2,{\mathbb R})$, we identify a continuum regime where the mean values and the covariances of the three Iwasawa parameters are simultaneously small. In this regime, the Lyapunov exponent of the product is shown to assume a scaling form. In the general case, the corresponding scaling function is expressed in terms of Gauss' hypergeometric function. A number of particular cases are also considered, where the scaling function of the Lyapunov exponent involves other special functions (Airy, Bessel, Whittaker, elliptic). The general solution thus obtained allows us, among other things, to recover in a unified framework many results known previously from exactly solvable models of one-dimensional disordered systems.

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