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arXiv 1206.2629math.AP
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椭圆型方程组极值解的正则性

Regularity of the extremal solutions associated to elliptic systems

Craig Cowan, Mostafa Fazly

摘要:

本文研究了由[(G)_{λ,γ} \quad -Δu = λ f '(u)g(v),\quad -Δv = γf(u)g'(v)\quad in $ Ω$,]和[(H)_{λ,γ} \quad -Δu = λf(u)g '(v),\quad -Δv = γ f'(u)g(v)\quad in $ Ω$ },]给出的两个椭圆型方程组,其中$ λ,γ$为正参数,Dirichlet边界条件为零.我们证明了对于任意非线性$f$和$g$,只要$ Ω$是$ \mathbb R^N$中的凸域,其中$ N \le 3$,则与$ (G)_{λ,γ}$相关的极值解是有界的.在径向区域的情况下,我们证明了极值解是有界的提供$ N <10$。与$ (H)_{λ,γ}$相关联的极值解在$ f$是任意的情况下是有界的,$ g(v)=(v+1)^q$其中$ 1 <q<\infty$和其中$ Ω$是$ \mathbb R^N$中的有界凸域,$ N \le 3$。结果也得到在更高的维度$ (G)_{λ,γ}$和$(H)_{λ,γ}$的情况下,明确的非线性形式$ f(u)=(u+1)^p$和$ g(v)=(v+1)^q$。

英文摘要:

We examine the two elliptic systems given by [(G)_{λ,γ} \quad -Δu = λf'(u) g(v), \quad -Δv = γf(u) g'(v) \quad in $ Ω$,] and [(H)_{λ,γ} \quad -Δu = λf(u) g'(v), \quad -Δv = γf'(u) g(v) \quad in $ Ω$},] with zero Dirichlet boundary conditions and where $ λ,γ$ are positive parameters. We show that for arbitrary nonlinearities $f$ and $g$ that the extremal solutions associated with $ (G)_{λ,γ}$ are bounded provided $ Ω$ is a convex domain in $ \mathbb R^N$ where $ N \le 3$. In the case of a radial domain we show the extremal solutions are bounded provided $ N <10$. The extremal solutions associated with $ (H)_{λ,γ}$ are bounded in the case where $ f$ is arbitrary, $ g(v)=(v+1)^q$ where $ 1 <q<\infty$ and where $ Ω$ is a bounded convex domain in $ \mathbb R^N$, $ N \le 3$. Results are also obtained in higher dimensions for $ (G)_{λ,γ}$ and $(H)_{λ,γ}$ for the case of explicit nonlinearities of the form $ f(u)=(u+1)^p$ and $ g(v)=(v+1)^q$.

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