## Decay character and estimates for the damped wave equation.(English)Zbl 1480.35030

The study refers to the linear damped wave equation $$u_{tt}-\Delta u+u_t=0$$, $$u(0)=f$$, $$u_t(0)=g$$, where $$u=u(x,t)$$, $$(x,t)\in\mathbb{R}^n \times [0,\infty)$$, as well as to the damped wave equation with absorption, $$u_{tt}-\Delta u+u_t=-|u|^{\alpha}u$$, $$u(0)=f$$, $$u_t(0)=g$$. The aim is to investigate decay properties of solutions and improve some known estimates on solutions and energy. Addressed are mainly the earlier results of A. Matsumura [Publ. Res. Inst. Math. Sci. 12, 169–189 (1976; Zbl 0356.35008)], and the results of R. Ikehata [Math. Methods Appl. Sci. 27, No. 8, 865–889 (2004; Zbl 1049.35135)]. The first section of the article is devoted to the presentation of the known estimates and decay results as well as to the presentation of new results. In the second section definitions and properties connected to the decay of solutions and properties of fundamental solutions to the linear damped equation are reviewed. The proofs of new estimates and decay of solutions are to be found in the last part of the second section and in the third section.

### MSC:

 35B40 Asymptotic behavior of solutions to PDEs 35L15 Initial value problems for second-order hyperbolic equations 35L71 Second-order semilinear hyperbolic equations 35B45 A priori estimates in context of PDEs

### Citations:

Zbl 0356.35008; Zbl 1049.35135
Full Text:

### References:

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