Traveling waves for a nonlocal dispersal susceptible–infected–recovered epidemic model with the mass action infection mechanism

Abstract

This paper is concerned with a nonlocal dispersal susceptible–infected–recovered (SIR) epidemic model adopted with the mass action infection mechanism. We mainly study the existence and non‐existence of traveling waves connecting the infection‐free equilibrium state and the endemic equilibrium state. The main difficulty lies in the fact that the semiflow generated here does not admit the order‐preserving property. Meanwhile, this new model brings some new challenges due to the unboundedness of the nonlinear term. We overcome these difficulties to obtain the boundedness of traveling waves with the speed by some analysis techniques firstly and then prove the existence of traveling waves by employing Lyapunov–LaSalle theorem and Lebesgue dominated convergence theorem. By utilizing an approximating method, we study the existence of traveling waves with the critical wave speed . Our results on this new model may provide some implications on disease modeling and controls.