Affiliation:
1. School of Mathematics and Information Science Guangzhou University Guangzhou China
Abstract
We study semilinear third‐order (in time) evolution equations with fractional Laplacian
and power nonlinearity
, which was proposed by Bezerra–Carvalho–Santos (J. Evol. Equ. 2022) recently. In this manuscript, we obtain a new critical exponent
for
. Precisely, the global (in time) existence of small data Sobolev solutions is proved for the supercritical case
, and energy solutions blow up in finite time even for small data if
. Furthermore, to more accurately describe the blow‐up time, we derive new and sharp upper bound and lower bound estimates for the lifespan in the subcritical case and the critical case.
Funder
National Natural Science Foundation of China
Basic and Applied Basic Research Foundation of Guangdong Province