整个指数型函数的汉克尔变换的终结泊恩卡雷渐近展开

Nathalie Liezel R. Rojas, Eric A. Galapon
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引用次数: 0

摘要

我们通过在复平面上移动积分轮廓,对任意大$tau$类型的整个指数函数$f(x)$的汉克尔变换,$int_0^{\infty}J_{\nu}(\lambda x) f(x)\mathrm{d}x$进行渐近评估。在$J_{\nu}(\lambda x)f(x)$ 相对于$x$为奇偶性以及渐近参数$\lambda$大于类型$\tau$的条件下,我们得到了一个精确终止的Poincar{'e}展开,没有任何尾随的次主导指数项。也就是说,当 $\lambda$ 接近无穷大时,汉克尔变换会精确地评估为反 $\lambda$ 的多项式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Terminating Poincare asymptotic expansion of the Hankel transform of entire exponential type functions
We perform an asymptotic evaluation of the Hankel transform, $\int_0^{\infty}J_{\nu}(\lambda x) f(x)\mathrm{d}x$, for arbitrarily large $\lambda$ of an entire exponential type function, $f(x)$, of type $\tau$ by shifting the contour of integration in the complex plane. Under the situation that $J_{\nu}(\lambda x)f(x)$ has an odd parity with respect to $x$ and the condition that the asymptotic parameter $\lambda$ is greater than the type $\tau$, we obtain an exactly terminating Poincar{\'e} expansion without any trailing subdominant exponential terms. That is the Hankel transform evaluates exactly into a polynomial in inverse $\lambda$ as $\lambda$ approaches infinity.
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