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arXiv 1202.4853math.CA
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修正Bessel函数的Turánians的界

Bounds for Turánians of modified Bessel functions

Árpád Baricz

摘要:

基于应用数学、生物学、化学、物理学和工程科学中的一些应用,导出了第一类和第二类修正Bessel函数的新的紧Turán型不等式.这些不等式为第一类和第二类修正贝塞尔函数的Turánian提供了尖锐的上下上界,并且在大多数情况下,当幅角趋于无穷大时,界的相对误差趋于零。我们证明的主要工具是Gronwall [19]关于常微分方程的一些思想,Ismail [28,29]关于第二类修正Bessel函数的商的整表示以及Hartman和Watson [24,26,59]的一些结果。作为主要结果的应用,对第一类和第二类修正Bessel函数的乘积给出了若干尖锐的Turán型不等式,并证明了该乘积是严格几何凹的.

英文摘要:

Motivated by some applications in applied mathematics, biology, chemistry, physics and engineering sciences, new tight Turán type inequalities for modified Bessel functions of the first and second kind are deduced. These inequalities provide sharp lower and upper bounds for the Turánian of modified Bessel functions of the first and second kind, and in most cases the relative errors of the bounds tend to zero as the argument tends to infinity. The chief tools in our proofs are some ideas of Gronwall [19] on ordinary differential equations, an integral representation of Ismail [28,29] for the quotient of modified Bessel functions of the second kind and some results of Hartman and Watson [24,26,59]. As applications of the main results some sharp Turán type inequalities are presented for the product of modified Bessel functions of the first and second kind and it is shown that this product is strictly geometrically concave.

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