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arXiv 1503.09038math-phmath.MP
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传递矩阵与数值稳定性分析的关系避免了$Ωd$问题

Relations between transfer matrices and numerical stability analysis to avoid the $Ωd$ problem

R. Pérez-Álvarez, R. Pernas-Salomón, V. R. Velasco

摘要:

传递矩阵法通常用于研究由矩阵Sturm-Liouville(MSL)型$N$方程描述的问题。在某些情况下,出现数值退化(所谓的$Ωd$问题),从而损害该方法的性能。我们在这里提出了一个程序,可以克服这个问题的情况下,具有分段常系数的多层系统。这是通过研究相关的传递矩阵和其他传递矩阵变量之间的关系来执行的。以这种方式,它是可能的矩阵,可以克服$Ωd$的问题,在一般情况下,然后在问题的特殊情况下,一般的。在此框架下,提出了不同的策略来解决不同的边界条件问题,通过这些数值稳定的矩阵。数值和分析的例子表明,这些稳定的变种是更充分的比其他矩阵方法,以克服$Ωd$问题。由于MSL系统的普遍性,这些结果可以应用于多层结构中许多元激发的研究。

英文摘要:

The transfer matrix method is usually employed to study problems described by $N$ equations of matrix Sturm-Liouville (MSL) kind. In some cases a numerical degradation (the so called $Ωd$ problem) appears thus impairing the performance of the method. We present here a procedure that can overcome this problem in the case of multilayer systems having piecewise constant coefficients. This is performed by studying the relations between the associated transfer matrix and other transfer matrix variants. In this way it was possible to obtain the matrices which can overcome the $Ωd$ problem in the general case and then in problems which are particular cases of the general one. In this framework different strategies are put forward to solve different boundary condition problems by means of these numerically stable matrices. Numerical and analytic examples are presented to show that these stable variants are more adequate than other matrix methods to overcome the $Ωd$ problem. Due to the ubiquity of the MSL system, these results can be applied to the study of many elementary excitations in multilayer structures.

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