(p, q)-Extended Bessel and Modified Bessel Functions of the First Kind

Abstract

Inspired by certain recent extensions of the Euler’s beta, Gaus hypergeometric and confluent hypergeometric functions (Choi et al. in Honam Math 36(2):339–367, 2014), we introduce (p, q)-extended Bessel function \(J_{\nu ,p,q}\), the (p, q)-extended modified Bessel function \(I_{\nu ,p,q}\) of the first kind of order \(\nu \) by making use two additional parameters in the integrand, as well as the (p, q)-extended Struve \(\mathbf{H}_{\nu ,p,q}\) and the modified Struve \(\mathbf{L}_{\nu ,p,q}\) functions. Systematic investigation of its properties, among others integral representations, bounding inequalites Mellin transforms (for all newly defined Bessel and Struve functions), complete monotonicity, Turan type inequality, associated non-homogeneous differential-difference equations (exclusively for extended Bessel functions) are presented. Brief presentation of another members of Bessel functions family: spherical, ultraspherical, Delerue hyper-Bessel and their modified counterparts and the Wright generalized Bessel function with links to their (p, q)-extensions are proposed.