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Transactions of the American Mathematical Society

Published by the American Mathematical Society since 1900, Transactions of the American Mathematical Society is devoted to longer research articles in all areas of pure and applied mathematics.

ISSN 1088-6850 (online) ISSN 0002-9947 (print)

The 2020 MCQ for Transactions of the American Mathematical Society is 1.48.

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Propagation dynamics of a time periodic and delayed reaction-diffusion model without quasi-monotonicity
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by Liang Zhang, Zhi-Cheng Wang and Xiao-Qiang Zhao PDF
Trans. Amer. Math. Soc. 372 (2019), 1751-1782 Request permission

Abstract:

In this paper, we consider a time periodic non-monotone and nonlocal delayed reaction-diffusion population model with stage structure. We first prove the existence of the asymptotic speed $c^*$ of spread by virtue of two auxiliary equations and comparison arguments. By the method of super- and sub-solutions and the fixed point theorem, as applied to the truncated problem on a finite interval, and the limiting arguments, we then establish the existence of time periodic traveling wave solutions of the model system with wave speed $c>c^*$. We further use the results of the asymptotic speed of spread to obtain the non-existence of traveling wave solutions for wave speed $c<c^*$. Finally, we prove the existence of the critical periodic traveling wave with wave speed $c=c^*$. It turns out that the asymptotic speed of spread coincides with the minimal wave speed for positive periodic traveling waves. These results are also applied to the model system with two prototypical birth functions.
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Additional Information
  • Liang Zhang
  • Affiliation: School of Mathematics and Statistics, Lanzhou University, Lanzhou, Gansu 730000, People’s Republic of China
  • MR Author ID: 1126029
  • Email: lz@lzu.edu.cn
  • Zhi-Cheng Wang
  • Affiliation: School of Mathematics and Statistics, Lanzhou University, Lanzhou, Gansu 730000, People’s Republic of China
  • MR Author ID: 782911
  • Email: wangzhch@lzu.edu.cn
  • Xiao-Qiang Zhao
  • Affiliation: Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, Canada
  • MR Author ID: 241619
  • Email: zhao@mun.ca
  • Received by editor(s): September 6, 2017
  • Received by editor(s) in revised form: May 25, 2018
  • Published electronically: March 25, 2019
  • Additional Notes: The first author was supported in part by NNSF of China (11701242) and the Fundamental Research Funds for the Central Universities (lzujbky-2017-27).
    The second author was supported in part by NNSF of China (11371179, 11731005) and the Fundamental Research Funds for the Central Universities (lzujbky-2017-ot09). The second author is the corresponding author
    The third author was supported in part by the NSERC of Canada.
    Zhi-Cheng Wang is the corresponding author
  • © Copyright 2019 American Mathematical Society
  • Journal: Trans. Amer. Math. Soc. 372 (2019), 1751-1782
  • MSC (2010): Primary 35B40, 35K57, 34K05; Secondary 46E25, 20C20
  • DOI: https://doi.org/10.1090/tran/7709
  • MathSciNet review: 3976576