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arXiv 0810.5140math.AP
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一类具有临界非线性项的半线性椭圆型方程解的先验估计

A priori estimate for a family of semi-linear elliptic equations with critical nonlinearity

Lei Zhang

摘要:

考虑了$Δu-μu+Ku^{\frac{n+2}{n-2}}=0$在$B_1$($n\ge 5$)上的正解,其中$μ$和$K>0$是$B_1$上的光滑函数.如果$K$在$B_{2/3}$中的$K$的每个临界点都是非常次调和的,并且$u$在$\bar B_{1/3}$中的最大值与它在$\bar B_1$上的最大值相当,则所有正解在$\bar B_{1/3}$上一致有界.作为应用,给出了定义在$\mathbb S^n$上的方程解的先验估计.

英文摘要:

We consider positive solutions of $Δu-μu+Ku^{\frac{n+2}{n-2}}=0$ on $B_1$ ($n\ge 5$) where $μ$ and $K>0$ are smooth functions on $B_1$. If $K$ is very sub-harmonic at each critical point of $K$ in $B_{2/3}$ and the maximum of $u$ in $\bar B_{1/3}$ is comparable to its maximum over $\bar B_1$, then all positive solutions are uniformly bounded on $\bar B_{1/3}$. As an application, a priori estimate for solutions of equations defined on $\mathbb S^n$ is derived.

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