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arXiv 1702.07073math.AP
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具有Fujita临界幂的高维半线性阻尼wave equation的寿命估计

The sharp lifespan estimate for semilinear damped wave equation with Fujita critical power in high dimensions

Ning-An Lai, Yi Zhou

摘要:

在高维$(n\geq 4)$中研究了具有Fujita临界指数的半线性阻尼波动方程Cauchy问题的寿命估计。我们通过使用热核作为检验函数,以下面的形式\begin{equation}\nonumber\\ \begin{aligned} T(\varepsilon)\leq \exp(C\varepsilon^{-\frac 2n}), \end{aligned} \end{equation}建立了寿命的精确上界。

英文摘要:

This paper is concerned about the lifespan estimate to the Cauchy problem of semilinear damped wave equations with the Fujita critical exponent in high dimensions$(n\geq 4)$. We establish the sharp upper bound of the lifespan in the following form \begin{equation}\nonumber\\ \begin{aligned} T(\varepsilon)\leq \exp(C\varepsilon^{-\frac 2n}), \end{aligned} \end{equation} by using the heat kernel as the test function.

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