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arXiv 0806.0859math-phgr-qchep-thmath.MP
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连带Legendre函数零点求和公式及其物理应用

Summation formula over the zeros of the associated Legendre function with a physical application

A. A. Saharian

摘要:

伴随勒让德函数出现在数学物理的许多问题中。本文利用推广的Abel-Plana公式,导出了第一类连带Legendre函数零点上的级数关于次数的求和公式.作为一个极限情况,在贝塞尔函数的零点上的级数的求和公式,以前在文献中讨论过,得到。在常负曲率空间背景下,研究了具有一般曲率耦合参数的标量场在球边界内的Wightman函数。相应的模式和包含相关勒让德函数的零上的系列。求和公式的应用允许我们以两个积分之和的形式来表示Wightman函数。第一个对应于Wightman函数的散装几何形状没有边界和第二个是由球壳的存在引起的。对于远离边界的点,后者在重合极限内是有限的。这样,真空场平方期望值的重整化就简化为无边界部分的重整化。

英文摘要:

Associated Legendre functions arise in many problems of mathematical physics. By using the generalized Abel-Plana formula, in this paper we derive a summation formula for the series over the zeros of the associated Legendre function of the first kind with respect to the degree. The summation formula for the series over the zeros of the Bessel function, previously discussed in the literature, is obtained as a limiting case. The Wightman function for a scalar field with general curvature coupling parameter is considered inside a spherical boundary on background of constant negative curvature space. The corresponding mode sum contains series over the zeros of the associated Legendre function. The application of the summation formula allows us to present the Wightman function in the form of the sum of two integrals. The first one corresponds to the Wightman function for the bulk geometry without boundaries and the second one is induced by the presence of the spherical shell. For points away from the boundary the latter is finite in the coincidence limit. In this way the renormalization of the vacuum expectation value of the field squared is reduced to that for the boundary-free part.

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