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arXiv 2302.02063math.AP
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半线性三阶发展方程的临界指数与精确寿命估计

Critical exponent and sharp lifespan estimates for semilinear third-order evolution equations

Wenhui Chen

AI总结:

本文研究了带分数阶拉普拉斯算子和幂非线性项的半线性三阶发展方程,推导出新的临界指数,并证明了小数据解的全局存在性与有限时间爆破,同时给出了次临界和临界情形下寿命的精确上下界估计。

摘要:

我们研究了带有分数阶拉普拉斯算子$(-Δ)^σ$和幂非线性项$|u|^p$的半线性三阶(时间)发展方程,该方程近期由Bezerra-Carvalho-Santos [2]提出。本文中,对于$n\leqslant\frac{10}{3}σ$的情况,我们得到了一个新的临界指数$p=p_{\mathrm{crit}}(n,σ):=1+\frac{6σ}{\max\{3n-4σ,0\}}$。具体而言,我们证明了在超临界情形$p>p_{\mathrm{crit}}(n,σ)$下,小数据Sobolev解的全局(时间)存在性;并且证明了若$1<p\leqslant p_{\mathrm{crit}}(n,σ)$,即使对于小数据,弱解也会在有限时间内爆破。此外,为了更准确地描述爆破时间,我们在次临界和临界情形下推导出了关于寿命的新的且精确的上界和下界估计。

英文摘要:

We study semilinear third-order (in time) evolution equations with fractional Laplacian $(-Δ)^σ$ and power nonlinearity $|u|^p$, which was proposed by Bezerra-Carvalho-Santos [2] recently. In this manuscript, we obtain a new critical exponent $p=p_{\mathrm{crit}}(n,σ):=1+\frac{6σ}{\max\{3n-4σ,0\}}$ for $n\leqslant\frac{10}{3}σ$. Precisely, the global (in time) existence of small data Sobolev solutions is proved for the supercritical case $p>p_{\mathrm{crit}}(n,σ)$, and weak solutions blow up in finite time even for small data if $1<p\leqslant p_{\mathrm{crit}}(n,σ)$. Furthermore, to more accurately describe the blow-up time, we derive new and sharp upper bound as well as lower bound estimates for the lifespan in the subcritical case and the critical case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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