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arXiv 2103.01732math-phmath.MP
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指数势中本征值和$K_{{\rm i}ν}(z)$零点关于阶的渐近估计

Asymptotic Estimation for Eigenvalues in the Exponential Potential and for Zeros of $K_{{\rm i}ν}(z)$ with Respect to Order

Yuri Krynytskyi, Andrij Rovenchak

摘要:

本文给出了虚阶修正贝塞尔函数$K_{{\rm i}ν}(z)$的$ν$零点的渐近性质的推导。这个推导是基于对正半轴上的指数势的准经典处理。$ν$ -零(零与阶有关)的渐近表达式包含Lambert $W$函数,该函数在大多数计算机代数系统和数值软件包中很容易获得。与包含对数的已知关系相比,该函数的使用提供了更高的估计精度,对数只是$x$中$W(x)$的首项。我们的结果确保精度足以满足实际应用。

英文摘要:

The paper presents the derivation of the asymptotic behavior of $ν$-zeros of the modified Bessel function of imaginary order $K_{{\rm i}ν}(z)$. This derivation is based on the quasiclassical treatment of the exponential potential on the positive half axis. The asymptotic expression for the $ν$-zeros (zeros with respect to order) contains the Lambert $W$ function, which is readily available in most computer algebra systems and numerical software packages. The use of this function provides much higher accuracy of the estimation comparing to known relations containing the logarithm, which is just the leading term of $W(x)$ at large $x$. Our result ensures accuracies sufficient for practical applications.

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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