arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1402.0113math.AP
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半线性椭圆型不等式组在孤立奇点的点态有界与爆破的非线性位势估计

Pointwise Bounds and Blow-up for Systems of Semilinear Elliptic Inequalities at an Isolated Singularity via Nonlinear Potential Estimates

Marius Ghergu, Steven D. Taliaferro, Igor E. Verbitsky

摘要:

研究了系统$0\leq -Δu\leq f(v)$ $0\leq -Δv\leq g(u)$在$B_1(0)\backslash\{0\}$中的$C^2$正解$u(x)$和$v(x)$在原点附近的行为,其中$f,g:(0,\infty)\to (0,\infty)$是连续函数.我们在$f$和$g$在$\infty$上提供了最优条件,使得该系统的解在原点附近满足逐点界。在维度$n=2$,我们表明,如果$\log^+ f$或$\log^+g$增长最多线性无穷大,此属性成立。在维数$n\geq 3$中,在假设$f(t)=O(t^λ)$,$g(t)=O(t^σ)$为$t\to \infty$,($λ, σ\geq 0$)的条件下,得到了一条新的临界曲线,它最优地描述了这种逐点界的存在性.我们的方法部分依赖于尖锐的估计自然出现在这种情况下的非线性潜力。

英文摘要:

We study the behavior near the origin of $C^2$ positive solutions $u(x)$ and $v(x)$ of the system $0\leq -Δu\leq f(v)$ $0\leq -Δv\leq g(u)$ in $B_1(0)\backslash\{0\}$ where $f,g:(0,\infty)\to (0,\infty)$ are continuous functions. We provide optimal conditions on $f$ and $g$ at $\infty$ such that solutions of this system satisfy pointwise bounds near the origin. In dimension $n=2$ we show that this property holds if $\log^+ f$ or $\log^+g$ grow at most linearly at infinity. In dimension $n\geq 3$ and under the assumption $f(t)=O(t^λ)$, $g(t)=O(t^σ)$ as $t\to \infty$, ($λ, σ\geq 0$), we obtain a new critical curve that optimally describes the existence of such pointwise bounds. Our approach relies in part on sharp estimates of nonlinear potentials which appear naturally in this context.

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