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arXiv 1902.06302math.AP
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小初值非线性heat equation模型在尺度不变Besov范数下的爆破

Blowup for the nonlinear heat equation with small initial data in scale-invariant Besov norms

Lorenzo Brandolese, Fernando Cortez

摘要:

考虑非线性热方程$u_t -Δu= u^{b},\ u(0,x)=u_0$的Cauchy问题,其中$b\geq 2$和$b\in \mathbb{N}$ .我们证明,初始数据$u_0\in \mathcal{S}(\mathbb{R}^{n})$(施瓦茨类)任意小的尺度不变Besov范数$\dot B^{-2/b}_{n(b-1) b/2,q}(\mathbb{R}^{n})$,可以产生解决方案,在有限时间内爆破。实例$b=3$回答了Yves Meyer提出的一个问题,我们的结果也证明了C.苗,B.~ Yuan和B.对于时间上的全局可解性,Zhang是最优的。

英文摘要:

We consider the Cauchy problem of the nonlinear heat equation $u_t -Δu= u^{b},\ u(0,x)=u_0$, with $b\geq 2$ and $b\in \mathbb{N}$. We prove that initial data $u_0\in \mathcal{S}(\mathbb{R}^{n})$ (the Schwartz class)arbitrarily small in the scale invariant Besov-norm$\dot B^{-2/b}_{n(b-1) b/2,q}(\mathbb{R}^{n})$, can produce solutions that blow up in finite time. The case $b=3$ answers a question raised by Yves Meyer.Our result also proves that the smallness assumption put in an earlier work by C. Miao, B.~Yuan and B. Zhang, for the global-in-time solvability, is essentially optimal.

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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