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arXiv 1901.00142math.CA
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指数函数与贝塞尔函数乘积之和的展开式

An expansion for the sum of a product of an exponential and a Bessel function

R B Paris

摘要:

我们研究收敛表示的衰减指数和贝塞尔函数的形式\[\sum_{n=1}^\infty \frac{e^{-an}}{(\frac{1}{2} bn)^ν}\,J_ν(bn),\]其中$J_ν(x)$是贝塞尔函数的第一类顺序$ν>-1/2$和$a$,$b$是积极的参数。通过一个双重的梅林-巴恩斯整表示我们得到了一个收敛的渐近展开,使评估这个总和在极限$a\to 0$与$b<2π$固定。当用修正的Bessel函数$K_ν(x)$代替Bessel函数时,得到了类似的结果。这些总和的交替版本也提到。

英文摘要:

We examine convergent representations for the sum of a decaying exponential and a Bessel function in the form \[\sum_{n=1}^\infty \frac{e^{-an}}{(\frac{1}{2} bn)^ν}\,J_ν(bn),\] where $J_ν(x)$ is the Bessel function of the first kind of order $ν>-1/2$ and $a$, $b$ are positive parameters. By means of a double Mellin-Barnes integral representation we obtain a convergent asymptotic expansion that enables the evaluation of this sum in the limit $a\to 0$ with $b<2π$ fixed. A similar result is derived for the sum when the Bessel function is replaced by the modified Bessel function $K_ν(x)$. The alternating versions of these sums are also mentioned.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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