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arXiv 2602.20699math.APmath.DS
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Hardy-Hénon方程中具有线性和拟线性扩散的全局自相似解

Global self-similar solutions for Hardy-Hénon equations with linear and quasilinear diffusion

Universidad Rey Juan Carlos(雷伊胡安卡洛斯大学)

Razvan Gabriel Iagar, Ariel Sánchez, Erik Sarrion-Pedralva

AI总结:

研究Hardy-Hénon方程中具有线性和拟线性扩散的全局自相似解的分类及存在性,揭示了临界指数对解结构的影响。

摘要:

Hardy-Hénon方程$$ u_t=Δu^m+|x|^σu^p, \quad (x,t)\in\mathbb{R}^N\times(0,\infty), $$的全局自相似解在指数范围$m\geq1$,$p>m$和$σ>\max\{-2,-N\}$内被分类。分类强烈依赖于著名的Fujita和Sobolev临界指数$$ p_F(σ)=m+\frac{σ+2}{N}, \quad p_S(σ)=\begin{cases} \frac{m(N+2σ+2)}{N-2}, & \text{如果} N\geq3, \\\\ \infty, & \text{如果} N\in\{1,2\}. \end{cases} $$确实,如果$p\in(p_F(σ),p_S(σ))$,两个方程都允许具有紧支撑(如果$m>1$)或当$|x|\to\infty$时具有高斯型尾的自相似解(如果$m=1$),以及满足$$ u(x,t)\sim C|x|^{-(σ+2)/(p-m)}, \quad \text{当} \\ |x|\to\infty. $$如果$p\geq p_S(σ)$,只有具有后者代数尾的自相似解存在,而对于$m<p\leq p_F(σ)$,不存在全局解。这些结果为深入研究这些解在Hardy-Hénon方程动力学中的作用开辟了道路。

英文摘要:

Global self-similar solutions to the parabolic Hardy-Hénon equation $$ u_t=Δu^m+|x|^σu^p, \quad (x,t)\in\mathbb{R}^N\times(0,\infty), $$ are classified in the range of exponents $m\geq1$, $p>m$ and $σ>\max\{-2,-N\}$. The classification varies strongly with respect to the celebrated \emph{Fujita} and \emph{Sobolev critical exponents} $$ p_F(σ)=m+\frac{σ+2}{N}, \quad p_S(σ)= \begin{cases} \frac{m(N+2σ+2)}{N-2}, & \mbox{if } N\geq3, \\[1mm] \infty, & \mbox{if } N\in\{1,2\}. \end{cases} $$ Indeed, if $p\in(p_F(σ),p_S(σ))$, both equations admit self-similar solutions with either compact support (if $m>1$) or Gaussian-like tail as $|x|\to\infty$ (if $m=1$), as well as a one-parameter family satisfying $$ u(x,t)\sim C|x|^{-(σ+2)/(p-m)}, \quad {\rm as} \ |x|\to\infty. $$ If $p\geq p_S(σ)$, there are only self-similar solutions with the latter algebraic tail, while for $m<p\leq p_F(σ)$ no global solutions exist. The results open the way for a deeper study of the role of these solutions in the dynamics of the Hardy-Hénon equations.

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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