Dynamical Analysis of a Rumor Propagation Model With Saturated Recruitment and Incorporated Control Strategies

Main Article Content

Lukman Hakim, Fatmawati, Ahmadin, Chinwendu E. Madubueze

Abstract

Unverified information can spread quickly and influence the public. In this work, we suggest and analyze a nonlinear rumor propagation model incorporating saturated incidence and optimal control. In this model, the qualitative properties of the model are rigorously analyzed. The positivity and boundedness of the solutions are established to ensure biological feasibility. The threshold dynamics is governed, equilibrium points are analyzed and their stability. Bifurcation analysis shows that forward bifurcations occur at a reproduction number equal to one. Sensitivity analysis reveals that rumor propagation is strongly influenced by contact rate with rumor, the direct probability of rumor, and the transition from rumor spreaders to lurkers. To design mitigation strategies, an optimal control is produced with two controls: educational control and truth-defender control. The optimality conditions are derived using Pontryagin’s and numerically utilizing the forward-backward sweep method. Numerical simulations demonstrate that truth dissemination is the dominant intervention in reducing rumor spreaders and lurkers, while contact reduction provides strong support in the early stage. The combined control strategy produces the most robust outcome by simultaneously minimizing the rumor and strengthening the corrective spread of information.

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