Optimization of the fractional-order parameter with the error analysis for human immunodeficiency virus under Caputo operator

Human immunodeficiency virus (HIV) infection is said to be a dangerous, extremely severe, and potentially fatal disease. After weakening a person's immune system, it impedes the body's ability to fend off future illnesses. In this study, we use the Caputo operator's fractional framework to describe how antiretroviral therapy (ART) affects the HIV/AIDS transmission process. Using fractional calculus, the basic characteristics of the formulated system are found. In addition, we investigated the steady states of the fractional system and determined the reproduction parameter R₀. A fractional framework has been used for stability analysis. The optimal value of the Caputo fractional-order is around 9. 437300e-01, and the system parameters are determined using the least-squares method, demonstrating that the system matches real HIV/AIDS data the best. Average and maximum absolute relative percentile errors have been used to draw comparisons between the classical and Caputo systems. The case summaries obtained demonstrate the Caputo operator's supremacy. A sensitivity test is run using the partial rank correlation coefficient (PRCC) technique to clearly see which parameters are crucial to the formulation of R₀. Lastly, a powerful numerical technique is used to run simulations that show the HIV/AIDS time series in the Caputo fractional framework.