Abstract
In this paper, we consider a pseudo-parabolic equation, which was studied extensively in recent years. We generalize and extend the existing results in the following three aspects. First, we consider the vacuum isolating phenomenon with the initial energy \(J(u_0)\) satisfying \(J(u_0)\le 0\) and \(0<J(u_0)<d\), respectively, where d is a positive constant denoting the potential well depth. By means of potential well method, we find that there are two explicit vacuum regions which are annulus and ball, respectively. Second, we study the asymptotic behaviors of the solutions and the energy functional. Generally speaking, we establish the exponential decay of the solutions and energy functional when the solutions exist globally, and the concrete decay rate is given. As for the blow-up solutions, we prove that the solutions grow exponentially and obtain the behavior of energy functional as the time t tends to the maximal existence time. We get further two necessary and sufficient conditions for the solutions existing globally and blowing up in finite time, respectively, under the assumption that \(J(u_0)<d\). Finally, we give a new blow-up condition with eigenfunction method; it should be point out that this initial condition is independent of the initial energy. Under this condition, an upper bound estimation of the blow-up time is obtained and we prove that the solutions grow exponentially; the grow speed is given specifically.
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Acknowledgements
The authors would like to thank the referees for their valuable comments and suggestions which improved the original manuscript. This work is supported by the Basic and Advanced Research Project of CQC-STC Grant cstc2016jcyjA0018, NSFC 11201380.
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Zhou, J., Xu, G. & Mu, C. Analysis of a pseudo-parabolic equation by potential wells. Annali di Matematica 200, 2741–2766 (2021). https://doi.org/10.1007/s10231-021-01099-1
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DOI: https://doi.org/10.1007/s10231-021-01099-1
Keywords
- Semilinear pseudo-parabolic equation
- Vacuum isolating phenomenon
- Invariant region
- Global existence
- Blow-up
- Energy decay
- Exponential grow