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arXiv 0903.4351math.AP
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具退化吸收势的半线性高阶抛物型方程解的熄灭

Extinction of solutions of semilinear higher order parabolic equations with degenerate absorption potential

Yves Belaud, Andrey Shishkov

摘要:

研究了半线性$2m$阶($m \geq 1$)抛物型方程$u_t+Lu+a(x) |u|^{q-1}u=0$,$0<q<1$,其中$a(x) \geq 0$有界于有界区域$Ω\subset \R^N$的Cauchy- Dirichlet问题解的第一消失时间.我们证明了如果$N>2m$和$\displaystyle \int_0^1 s^{-1} \text{meas} \{x \in Ω: |a(x)| \leq s \}^\frac{2m}{N} ds < + \infty$,那么解$u$在有限时间内消失。当为$N=2m$时,条件变为$\displaystyle \int_0^1 s^{-1} (\text{meas} \{x \in Ω: |a(x)| \leq s \}) (-\ln \text{meas} \{x \in Ω: |a(x)| \leq s \}) ds < + \infty$。

英文摘要:

We study the first vanishing time for solutions of the Cauchy-Dirichlet problem to the semilinear $2m$-order ($m \geq 1$) parabolic equation $u_t+Lu+a(x) |u|^{q-1}u=0$, $0<q<1$ with $a(x) \geq 0$ bounded in the bounded domain $Ω\subset \R^N$. We prove that if $N>2m$ and $\displaystyle \int_0^1 s^{-1} \text{meas} \{x \in Ω: |a(x)| \leq s \}^\frac{2m}{N} ds < + \infty$, then the solution $u$ vanishes in a finite time. When $N=2m$, the condition becomes $\displaystyle \int_0^1 s^{-1} (\text{meas} \{x \in Ω: |a(x)| \leq s \}) (-\ln \text{meas} \{x \in Ω: |a(x)| \leq s \}) ds < + \infty$.

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