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Infinite series involving special functions obtained using simple one-dimensional quantum mechanical problems

Quantum Physics 2025-03-27 v3 Mathematical Physics math.MP

Abstract

In this paper certain classes of infinite sums involving special functions are evaluated analytically by application of basic quantum mechanical principles to simple models of half harmonic oscillator and a particle trapped inside an infinite potential well. The infinite sums n=022n(2n+1)!Γ2(n+32)[2F1(n,ν+22;32;12)]2\sum^{\infty}_{n=0}\frac{2^{2n}}{(2n+1)!}\Gamma^{2}\left(n+\frac{3}{2}\right)\left[\hspace{0.2mm}_2\hspace{-0.03cm}F_1\left(-n,\frac{\nu+2}{2};\frac{3}{2};\frac{1}{2}\right)\right]^{2}, n=0[Lν2n+1ν(b22)]2b4n22n(2n+1)!\sum^{\infty}_{n=0}\frac{\left[L_{\nu}^{2n+1-\nu}\left(\frac{b^{2}}{2}\right)\right]^{2}b^{4n}}{2^{2n}(2n+1)!} and n=1[Jν+1(nπ)]2n2ν\sum^{\infty}_{n=1}\frac{\big[J_{\nu+1}(n\pi)\big]^{2}}{n^{2\nu}}, where 2F1(n,ν+22;32;12)_2\hspace{-0.03cm}F_1\left(-n,\frac{\nu+2}{2};\frac{3}{2};\frac{1}{2}\right) is generalized hypergeometric function, Lν2n+1ν(b22)L_{\nu}^{2n+1-\nu}\left(\frac{b^{2}}{2}\right) associated Laguerre polynomial and Jν+1(nπ)J_{\nu+1}(n\pi) Bessel function of the first kind, are calculated for integer ν\nu. It is also demonstrated that the same procedure can be generalized by application to some classes of functions which are not regular wave functions leading to additional infinite sums, as a consequence of which the series n=1[Hν(nπ)]2n2ν\sum_{n=1}^{\infty}\frac{\left[\mathsf{H}_{\nu}(n\pi)\right]^{2}}{n^{2\nu}} containing Struve functions of the first kind Hν(nπ)\mathsf{H}_{\nu}(n\pi) are evaluated. Convergence of the evaluated series, additionally verified by the application of different convergence tests, is secured by the properties of the corresponding Hilbert space.

Keywords

Cite

@article{arxiv.2411.10126,
  title  = {Infinite series involving special functions obtained using simple one-dimensional quantum mechanical problems},
  author = {Sonja Gombar and Milica Rutonjski and Petar Mali and Slobodan Radošević and Milan Pantić and Milica Pavkov-Hrvojević},
  journal= {arXiv preprint arXiv:2411.10126},
  year   = {2025}
}

Comments

13 pages, 1 figure, 4 tables

R2 v1 2026-06-28T20:01:07.803Z