On semilinear damped wave equations with initial data in homogeneous Sobolev spaces

Abstract

In this paper, we study semilinear damped equations $u_{tt}+u_t-Δu=|u|^p$ with the initial data in $(\dot{H}^{-γ}\cap H^s)\times(\dot{H}^{-γ}\cap L^2)$ with the dimension $n\le n$. Chen-Reissig(2023) studied the case $0<γ\le\min\{\frac{n}{2}, (-n+\sqrt{n^2+16n})/4\}$ and showed that the exponent $p_{\mathrm{crit}}=1+4/(n+2γ)$ of $p$ distinguishes the time global existence and the blow-up of solution. In this paper, we discuss the case $γ\ge\min\{\frac{n}{2}, (-n+\sqrt{n^2+16n})/4\}$ and show that the critical exponent is not $1+4/(n+2γ)$ but $1+\frac{2}{n}$ for $n=1,2$, and $(n+\sqrt{n^2+16n})/(2n)$ for $3\le n\le 6$.