Electron. J. Differential Equations, Vol. 2024 (2024), No. 04, pp. 1-31.

Global existence and asymptotic profile for a damped wave equation with variable-coefficient diffusion

Yuequn Li, Hui Liu, Fei Guo

Abstract:
We considered a Cauchy problem of a one-dimensional semilinear wave equation with variable-coefficient diffusion, time-dependent damping, and perturbations. The global well-posedness and the asymptotic profile are given by employing scaling variables and the energy method. The lower bound estimate of the lifespan to the solution is obtained as a byproduct.

Submitted August 27, 2023. Published January 8, 2024.
Math Subject Classifications: 35B44, 35G25.
Key Words: Semilinear damped wave equation; asymptotic profile; lifespan; scaling variables; energy method.
DOI: 10.58997/ejde.2024.04

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Yuequn Li
School of Mathematical Sciences
Nanjing Normal University
Nanjing 210023, China
email: liyuequn1997@163.com
Hui Liu
School of Mathematical Sciences
Nanjing Normal University
Nanjing 210023, China
email: 1412797891@qq.com
Fei Guo
School of Mathematical Sciences and Key Laboratory for NSLSCS
Ministry of Education, Nanjing Normal University
Nanjing 210023, China
email: guof@njnu.edu.cn

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