Acta mathematica scientia,Series A ›› 2025, Vol. 45 ›› Issue (3): 726-747.

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Breakdown of Solutions to a Weakly Coupled System of Semilinear Wave Equations

Zhendong Feng1(),Fei Guo2,3,*(),Yuequn Li2()   

  1. 1School of Intelligent Manufacturing, Lishui Vocational and Technical College, Zhejiang Lishui 323000
    2School of Mathematical Sciences, Nanjing Normal University, Nanjing 210023
    3Key Laboratory of NSLSCS (NNU), Ministry of Education, Nanjing 210023
  • Received:2024-01-25 Revised:2024-10-15 Online:2025-06-26 Published:2025-06-20
  • Supported by:
    NSFC(11731007);Priority Academic Program Development of Jiangsu Higher Education Institutions, the NSF of Jiangsu Province(BK20221320);Postgraduate Research and Practice Innovation Program of Jiangsu Province(KYCX24_1786)

Abstract:

This paper addresses the Cauchy problem for a weakly coupled system of semilinear wave equations with scale-invariant dampings, mass, and general nonlinear memory terms. Firstly, a local (in time) existence result for this problem is established using Banach's fixed point theorem, subject to suitable assumptions on the exponents p,q and coefficients μ1,μ2.Here, p and q represent the powers of the nonlinear memory terms, while μ1 and μ2 denote the coefficients of the dampings and mass terms, respectively. It is noteworthy that Palmieri's decay estimates for the solution to the corresponding linear homogeneous equation play a crucial role in proving the local well-posedness result. Subsequently, employing an iteration technique in conjunction with the test function method, we obtain a blowup result for energy solutions.

Key words: semilinear wave equation, weakly coupled system, blowup, test function method, iteration skill

CLC Number: 

  • O175.27
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