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arXiv 0802.1804math.APmath.DS
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具有奇异位势的反应扩散方程的半流

The semiflow of a reaction diffusion equation with a singular potential

Nikos I. Karachalios, Nikos B. Zographopoulos

摘要:

研究了半线性抛物型方程的奇异平方势$V(x)=\fracμ{|x|^2}$的半流$\mathcal{S}(t)$。众所周知,Hardy-Poincaré不等式及其改进形式在自然相空间的定义中具有突出的作用。我们的研究涉及的情况$0<μ\leqμ^*$,其中$μ^*$是最佳常数的Hardy-Poincaré不等式。在$\mathbb{R}^N$的有界区域上,以$λ$为分支参数,证明了反应项$f(s)=λs-|s|^{2γ}s$的非平凡平衡解的全局分支。利用全局分歧结果表明,从初始数据$ϕ_0\geq 0$($ϕ_0\leq 0$),$ϕ_0\not\equiv 0$出发的解$ϕ(t)=\mathcal{S}(t)ϕ_0$,都趋于唯一的非负(非正)平衡点.

英文摘要:

We study the semiflow $\mathcal{S}(t)$ defined by a semilinear parabolic equation with a singular square potential $V(x)=\fracμ{|x|^2}$. It is known that the Hardy-Poincaré inequality and its improved versions, have a prominent role on the definition of the natural phase space. Our study concerns the case $0<μ\leqμ^*$, where $μ^*$ is the optimal constant for the Hardy-Poincaré inequality. On a bounded domain of $\mathbb{R}^N$, we justify the global bifurcation of nontrivial equilibrium solutions for a reaction term $f(s)=λs-|s|^{2γ}s$, with $λ$ as a bifurcation parameter. The global bifurcation result is used to show that any solution $ϕ(t)=\mathcal{S}(t)ϕ_0$, initiating form initial data $ϕ_0\geq 0$ ($ϕ_0\leq 0$), $ϕ_0\not\equiv 0$, tends to the unique nonnegative (nonpositive) equilibrium.

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