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arXiv 2104.14166math.AP
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临界加权Lebesgue空间中Hardy-Hénon抛物型方程的最优适定性和向前自相似解

Optimal well-posedness and forward self-similar solution for the Hardy-Hénon parabolic equation in critical weighted Lebesgue spaces

Noboru Chikami, Masahiro Ikeda, Koichi Taniguchi

摘要:

在欧几里得空间$\mathbb{R}^d$上的加权Lebesgue空间中研究了Hardy-Hénon抛物型方程在临界和次临界区域的Cauchy问题.奇异初始数据的适定性和非径向向前自相似解的存在性以前仅在Hardy和Fujita的情况下($γ\le 0$)在早期的作品。加权空间使我们能够把潜在的$|x|^γ$作为一个增加或减少的重量,从而我们可以证明适定性的问题,所有$γ$与$-\min\{2,d\}<γ$,包括Hénon的情况下($γ>0$)。作为适定性的一个副产品,该问题的自相似解决方案也被构造为所有$γ$没有限制。对于超临界数据,给出了局部解的不存在性结果。因此,我们的临界指数$s_c$在可解性方面是最优的。

英文摘要:

The Cauchy problem for the Hardy-Hénon parabolic equation is studied in the critical and subcritical regime in weighted Lebesgue spaces on the Euclidean space $\mathbb{R}^d$. Well-posedness for singular initial data and existence of non-radial forward self-similar solution of the problem are previously shown only for the Hardy and Fujita cases ($γ\le 0$) in earlier works. The weighted spaces enable us to treat the potential $|x|^γ$ as an increase or decrease of the weight, thereby we can prove well-posedness to the problem for all $γ$ with $-\min\{2,d\}<γ$ including the Hénon case ($γ>0$). As a byproduct of the well-posedness, the self-similar solutions to the problem are also constructed for all $γ$ without restrictions. A non-existence result of local solution for supercritical data is also shown. Therefore our critical exponent $s_c$ turns out to be optimal in regards to the solvability.

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