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arXiv 1504.04847math.APmath.CA
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加权Moser-Trudinger不等式的最佳常数和最大化解的存在性

Best constants and existence of maximizers for weighted Moser-Trudinger inequalities

Mengxia Dong, Guozhen Lu

摘要:

本文在整个欧几里得空间$\mathbb{R}^N$上建立了一类加权Moser-Trudinger不等式的最佳常数.我们还将证明这些尖锐的加权不等式的极大化的存在性。这里考虑的函数类不一定是球对称的。定理1.1中的不等式改进了M. Ishiwata,M.中村,H。\cite{INW}中的Wadade($s\not=0$除外)。由于$\int_{\mathbb{R}^N}Φ_N(α|u|^{N/(N-1)})\frac{dx}{|x|^t}\le \int_{\mathbb{R}^N}e^{α|u|^{N/(N-1)}}|u|^N\frac{dx}{|x|^t}$,我们在定理1.2中的不等式比定理1.1中的不等式更强。我们注意到,它足以让我们证明上述不等式的所有功能不一定径向对称时,$s=t$由著名的Caffareli-Kokn-Nirenberg不等式\cite{CKN}。

英文摘要:

In this paper, we will establish the best constants for certain classes of weighted Moser-Trudinger inequalities on the entire Euclidean spaces $\mathbb{R}^N$. We will also prove the existence of maximizers of these sharp weighted inequalities. The class of functions considered here are not necessarily spherically symmetric. Our inequality in Theorem 1.1 improves the earlier one where such type of inequality was only considered for spherically symmetric functions by M. Ishiwata, M. Nakamura, H. Wadade in \cite{INW} (except in the case $s\not=0$). Since $\int_{\mathbb{R}^N}Φ_N(α|u|^{N/(N-1)})\frac{dx}{|x|^t}\le \int_{\mathbb{R}^N}e^{α|u|^{N/(N-1)}}|u|^N\frac{dx}{|x|^t}$, our inequality in Theorem 1.2 is stronger than the inequality in Theorem 1.1. We note that it suffices for us to prove the above inequalities for all functions not necessarily radially symmetric when $s=t$ by the well-known Caffareli-Kokn-Nirenberg inequalities \cite{CKN}.

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