AccScience Publishing / IJOCTA / Online First / DOI: 10.36922/IJOCTA026030010
RESEARCH ARTICLE

On the integral transform of generalized k-Hilfer–Prabhakar fractional derivative with applications to fractional type advection–dispersion equations

Ved Prakash Dubey1 Jagdev Singh2∗ Jitesh Pati Tripathi3 Sarvesh Dubey4 Dumitru Baleanu5 Devendra Kumar6
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1 Department of Bachelor of Computer Application, Faculty of Science, Laxmi Narain Dubey College (Affiliated to Babasaheb Bhimrao Ambedkar Bihar University), Motihari, Bihar, India
2 Department of Mathematics, School of Sciences, JECRC University, Jaipur, Rajasthan, India
3 University Department of Mathematics, Faculty of Science, Babasaheb Bhimrao Ambedkar Bihar University, Muzaffarpur, Bihar, India
4 University Department of Physics, Faculty of Science, Babasaheb Bhimrao Ambedkar Bihar University, Muzaffarpur, Bihar, India
5 Department of Computer Science and Mathematics, School of Arts and Sciences, Lebanese American University, Beirut, Lebanon
6 Department of Mathematics, Faculty of Science, University of Rajasthan, Jaipur, Rajasthan, India
Received: 18 January 2026 | Revised: 1 March 2026 | Accepted: 4 March 2026 | Published online: 30 April 2026
© 2026 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution -Noncommercial 4.0 International License (CC-by the license) ( https://creativecommons.org/licenses/by-nc/4.0/ )
Abstract

The Hilfer-Prabhakar (HP) derivatives are advance class of fractional operators with nonlocal features, memory effects, and nonexponential decay. These derivatives are generally used in study of  heterogeneous systems, anomalous diffusion, dielectric spectroscopy, free electron lasers, fractional heat equations, and Cauchy problems. In this study, we derive the Kharrat–Toma (KT) transforms of the kernel function of the k-Prabhakar integral (k-PI), k-Prabhakar fractional derivative, its regularized form, and the k-Hilfer–Prabhakar fractional derivative (k-HPFD). We also establish the relationship between the k-Prabhakar fractional derivative and its regularized form for an absolutely continuous function using KT transform operations. Similarly, the KT transforms of k -HPFD and its regularized variant have been computed. Moreover, we establish the relationship between the k-HPFD and its regularized form using KT transform operations. Furthermore, we present solutions to Cauchy problems and generalized Cauchy problems for a fractional heat model involving the k -HPFD using the KT transform combined with the Fourier transform. Finally, we propose an integral technique combining the KT and Fourier transforms to construct solutions for the fractional advection–dispersion equation governed by the k -HPFD. The solutions of the Cauchy problems and advection–dispersion equations involving the k -HPFD and its Caputo form are expressed in terms of a generalized Mittag-Leffler function through sequential application of integral transform techniques. It is observed that the solutions for the generalized Cauchy problems and advection–dispersion equations involving the k -HPFD operator reduce to those involving the Hilfer fractional derivative, Riemann–Liouville fractional derivative, and Caputo derivative for specific parameter values.

Keywords
Generalized Mittag-Leffler function
k-Hilfer–Prabhakar fractional derivative
Cauchy equations
Kharrat–Toma transform
Funding
None.
Conflict of interest
The authors declare they have no competing interests.
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