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arXiv 1407.0243math.AP
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半线性椭圆型方程半稳定解的先验估计

A priori estimates for semistable solutions of semilinear elliptic equations

Xavier Cabre, Manel Sanchon, Joel Spruck

摘要:

考虑Dirichlet边界条件为零的$Lu+f(u)=0$的正半稳定解$u$,其中$L$是一致椭圆算子,$f\in C^2$是在无穷远处超线性的非减凸非线性项.在这些假设下,所有的半稳定的解决方案的有界性,预计到尺寸$n\leq 9$,但只建立$n\leq 4$。本文在对$f$的进一步假设下证明了$L^\infty$与维数$n=5$的绑定:对每个$\varepsilon>0$,存在$T=T(\varepsilon)$和$C=C(\varepsilon)$,使得对所有$t>T$有$f'(t)\leq Cf(t)^{1+\varepsilon}$.该界限由每个$p<3$和$n\geq 2$的$f'(u)$的$L^p$估计得出。在一个类似的,但更严格的假设$f$,我们也证明了$L^\infty$估计时$n=6$。我们注意到,我们的结果不假设任何下界$f'$。

英文摘要:

We consider positive semistable solutions $u$ of $Lu+f(u)=0$ with zero Dirichlet boundary condition, where $L$ is a uniformly elliptic operator and $f\in C^2$ is a positive, nondecreasing, and convex nonlinearity which is superlinear at infinity. Under these assumptions, the boundedness of all semistable solutions is expected up to dimension $n\leq 9$, but only established for $n\leq 4$. In this paper we prove the $L^\infty$ bound up to dimension $n=5$ under the following further assumption on $f$: for every $\varepsilon>0$, there exist $T=T(\varepsilon)$ and $C=C(\varepsilon)$ such that $f'(t)\leq Cf(t)^{1+\varepsilon}$ for all $t>T$. This bound follows from a $L^p$-estimate for $f'(u)$ for every $p<3$ and $n\geq 2$. Under a similar but more restrictive assumption on $f$, we also prove the $L^\infty$ estimate when $n=6$. We remark that our results do not assume any lower bound on $f'$.

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