数学物理学报(英文版) ›› 2025, Vol. 45 ›› Issue (5): 2088-2119.doi: 10.1007/s10473-025-0515-x

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MINIMUM WAVE SPEED OF A REACTION-DIFFUSION DENGUE MODEL WITH ASYMPTOMATIC CARRIER TRANSMISSION

Qin XING1,2,3, Rui XU1,2,*   

  1. 1. Complex Systems Research Center, Shanxi University, Taiyuan 030006, China;
    2. Complex Systems and Data Science Key Laboratory of Ministry of Education, Shanxi University, Taiyuan 030006, China;
    3. School of Mathematics and Statistics, Shanxi University, Taiyuan 030006, China
  • 收稿日期:2024-03-04 修回日期:2024-06-23 出版日期:2025-09-25 发布日期:2025-10-14

MINIMUM WAVE SPEED OF A REACTION-DIFFUSION DENGUE MODEL WITH ASYMPTOMATIC CARRIER TRANSMISSION

Qin XING1,2,3, Rui XU1,2,*   

  1. 1. Complex Systems Research Center, Shanxi University, Taiyuan 030006, China;
    2. Complex Systems and Data Science Key Laboratory of Ministry of Education, Shanxi University, Taiyuan 030006, China;
    3. School of Mathematics and Statistics, Shanxi University, Taiyuan 030006, China
  • Received:2024-03-04 Revised:2024-06-23 Online:2025-09-25 Published:2025-10-14
  • Contact: *Rui Xu, E-mail: rxu88@163.com
  • About author:Qin Xing, E-mail: xingqin5103@163.com
  • Supported by:
    Xu's research was supported by the National Natural Science Foundation of China (12271317, 11871316).

摘要: Dengue is a mosquito-borne disease that is rampant worldwide, with up to 70\% of cases reported to be asymptomatic during epidemics. In this paper, a reaction-diffusion dengue model with asymptomatic carrier transmission is investigated. We aim to study the existence, nonexistence and minimum wave speed of traveling wave solutions to the model. The results show that the existence and nonexistence of traveling wave solutions are fully determined by the threshold values, which are, the basic reproduction number $R_0$ and critical wave speed $c^*>0$. Specifically, when $R_0>1$ and the wave speed $c\ge c^*$, the existence of the traveling wave solution is obtained by using Schauder's fixed point theorem and Lyapunov functional. It is proven that the model has no nontrivial traveling wave solutions for $R_0\le1$ or $R_0>1$ and $0<c<c^*$ by employing comparison principle and limit theory. As a consequence, we conclude that the critical wave speed $c^*$ is the minimum wave speed of the model. Finally, numerical simulations are carried out to illustrate the effects of several important parameters on the minimum wave speed.

关键词: dengue, asymptomatic carriers, reaction-diffusion, traveling wave solutions, minimum wave speed

Abstract: Dengue is a mosquito-borne disease that is rampant worldwide, with up to 70\% of cases reported to be asymptomatic during epidemics. In this paper, a reaction-diffusion dengue model with asymptomatic carrier transmission is investigated. We aim to study the existence, nonexistence and minimum wave speed of traveling wave solutions to the model. The results show that the existence and nonexistence of traveling wave solutions are fully determined by the threshold values, which are, the basic reproduction number $R_0$ and critical wave speed $c^*>0$. Specifically, when $R_0>1$ and the wave speed $c\ge c^*$, the existence of the traveling wave solution is obtained by using Schauder's fixed point theorem and Lyapunov functional. It is proven that the model has no nontrivial traveling wave solutions for $R_0\le1$ or $R_0>1$ and $0<c<c^*$ by employing comparison principle and limit theory. As a consequence, we conclude that the critical wave speed $c^*$ is the minimum wave speed of the model. Finally, numerical simulations are carried out to illustrate the effects of several important parameters on the minimum wave speed.

Key words: dengue, asymptomatic carriers, reaction-diffusion, traveling wave solutions, minimum wave speed

中图分类号: 

  • 35C07