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arXiv 1102.1924math.FA
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无边界条件下Laplacian算子的Sharp Moser-Trudinger不等式

Sharp Moser-Trudinger inequalities for the Laplacian without boundary conditions

Luigi Fontana, Carlo Morpurgo

摘要:

本文对W^{2,n/2}(B_n)在指数类中的边界Sobolev嵌入给出了一个尖锐的Moser-Trudinger不等式,其中B_n是R^n的单位球.空间W_0^{d,n/d}(Ω)对于一般域Ω的相应的精确结果是众所周知的,并且是由Moser和Adams得到的。当零边界条件被删除时,唯一已知的结果是d=1,是由于Chang-Yang,Cianchi和Leckband。我们的证明是基于作者最近得到的一般抽象结果和球上泊松方程的“正则”解的一个新的整表示公式,即方程Δu=f的唯一解与球上的调和函数正交.本文的主要技术难点是建立这种表示的核的渐近锐增长估计,表示为它的分布函数。我们还将考虑指数类被赋予更一般的Borel测度的情形,并得到相应的迹型Moser-Trudinger不等式。

英文摘要:

We derive a sharp Moser-Trudinger inequality for the borderline Sobolev imbedding of W^{2,n/2}(B_n) into the exponential class, where B_n is the unit ball of R^n. The corresponding sharp results for the spaces W_0^{d,n/d}(Ω) are well known, for general domains Ω, and are due to Moser and Adams. When the zero boundary condition is removed the only known results are for d=1 and are due to Chang-Yang, Cianchi and Leckband. Our proof is based on general abstract results recently obtained by the authors, and on a new integral representation formula for the "canonical" solution of the Poisson equation on the ball, that is the unique solution of the equation Δu=f which is orthogonal to the harmonic functions on the ball. The main technical difficulty of the paper is to establish an asymptotically sharp growth estimate for the kernel of such representation, expressed in terms of its distribution function. We will also consider the situation where the exponential class is endowed with more general Borel measures, and obtain corresponding sharp Moser-Trudinger inequalities of trace type.

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