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REGULARITY OF EXTREMAL SOLUTIONS OF SEMILINEAR ELLIPTIC PROBLEMS WITH NON-CONVEX NONLINEARITIES ON GENERAL DOMAINS

机译:一般域上具有非凸非线性的半线性椭圆问题极值解的规律

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摘要

We consider the semilinear elliptic equation — ∆u = λf(u) in a smooth bounded domain Ω of R~n with Dirichlet boundary condition, where f is a C~1 positive and nondeccreasing function in [0,∞) such that -too as t →∞. When ft is an arbitrary domain and f is not necessarily convex, the boundedness of the extremal solution u~* is known only for n = 2, established by X. Cabre [5]. In this paper, we prove this for higher dimensions depending on the nonlinearity f. In particular, we prove that if 1/2<β_:=liminf_(t→∞) (f′(t)F(t))/(f(t)~2)≤β_+ :=,im sup_(t→∞)(f′(t)F(t)/(f(t)~2)<∞, where F(t) = ∫_0~t f(s)ds, then u~* € L~∞(Ω), for n < 6. Also, if β_ = β+ > 1/2 or 1/2< β_ ≤ β_+ < 7/10, then u~* € L~∞(Ω), for n ≤ 9. Moreover, under the sole condition that β_ > 1/2 we have u~* ∈ H_0~1(Ω) for n ≥ 1. The same is true if for some є > 0 we have (tf'(t) /(f(t))≥1+1/((ln t)~(2-є)) for larget t, which improves a similar result by Brezis and Vazquez [4].
机译:我们考虑具有Dirichlet边界条件的R〜n的光滑有界域in中的半线性椭圆方程— ∆u =λf(u),其中f是[0,∞)中C〜1的正和不变函数,使得-o为t→∞。当ft是任意域且f不一定是凸的时,仅由X. Cabre [5]建立的n = 2才知道极值解u〜*的有界性。在本文中,我们根据非线性f证明了更高的尺寸。特别地,我们证明如果1/2 <β_:= liminf_(t→∞)(f′(t)F(t))/(f(t)〜2)≤β_+:=,im sup_(t →∞)(f′(t)F(t)/(f(t)〜2)<∞,其中F(t)=∫_0〜tf(s)ds,则u〜*€L〜∞(Ω ),对于n <6.此外,如果β_=β+> 1/2或1/2 <β_≤β_+ <7/10,则u〜*€L〜∞(Ω),对于n≤9。 ,在β_> 1/2的唯一条件下,对于n≥1,我们有u〜*∈H_0〜1(Ω)。对于某些є> 0,我们有(tf'(t)/(f(对于较大的t,t))≥1+ 1 /((ln t)〜(2-є)),这改善了Brezis和Vazquez的相似结果[4]。

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