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arXiv 1906.12059math.AP
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非标度不变半线性wave equations的爆破速率

The blow-up rate for a non-scaling invariant semilinear wave equations

Mohamed ali Hamza, Hatem Zaag

摘要:

考虑半线性波动方程$$\partial_t^2 u -Δu =f(u), \quad (x,t)\in \mathbb{R}^N\times [0,T),\qquad (1)$$与$f(u)=|u|^{p-1}u\log^a (2+u^2)$,其中$p>1$与$a\in \mathbb{R}$ .我们证明了(1)的任何爆破解的一个上界。然后,在一维情形下,利用这个估计和对数性质,我们证明了方程(1)的任何奇异解的精确爆破速率都由与$(1)$相关的ODE解给出,即$u'' =|u|^{p-1}u\log^a (2+u^2)$。与纯幂情形($g(u)=|u|^{p-1}u$)不同,这里的困难是由于方程(1)不是标度不变的。

英文摘要:

We consider the semilinear wave equation $$\partial_t^2 u -Δu =f(u), \quad (x,t)\in \mathbb{R}^N\times [0,T),\qquad (1)$$ with $f(u)=|u|^{p-1}u\log^a (2+u^2)$, where $p>1$ and $a\in \mathbb{R}$. We show an upper bound for any blow-up solution of (1). Then, in the one space dimensional case, using this estimate and the logarithmic property, we prove that the exact blow-up rate of any singular solution of (1) is given by the ODE solution associated with $(1)$, namely $u'' =|u|^{p-1}u\log^a (2+u^2)$ Unlike the pure power case ($g(u)=|u|^{p-1}u$) the difficulties here are due to the fact that equation (1) is not scale invariant.

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