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arXiv 2408.10697math.AP
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临界Sobolev型不等式和恒等式的柱面扩张

Cylindrical extensions of critical Sobolev type inequalities and identities

Michael Ruzhansky, Yerkin Shaimerdenov, Nurgissa Yessirkegenov

摘要:

本文研究了临界Sobolev型(改进的Hardy)不等式和恒等式在Badiale-Tarantello [BT 02]中的柱面扩张,在特殊情形下给出了临界Hardy不等式及其稳定性结果.我们还得到了高阶恒等式,有趣的是,它包括著名的数,如双阶乘,椭圆数和第二类斯特林数。在没有实值函数假设的情况下,得到了$L^{p}$中关于$p\in (1,\infty)$的所有函数恒等式,从而对相应的不等式以及非平凡极值的不存在性给出了简单而直接的理解.作为应用,我们得到了带对数权的Caffarelli-Kohn-Nirenberg型不等式,在特殊情况下,它给出了Heisenberg-Pauli-Weyl型测不准原理的临界情形.我们还讨论了Folland和Stein的齐次李群中的结果。一个特别的重点是致力于分层李群,其中Sobolev型不等式成为错综复杂的交织在一起的次拉普拉斯算子和更一般的次椭圆偏微分方程的属性。所得到的结果已经是新的,即使在经典的欧几里德设置的参数范围和任意性的选择任何齐次准范数。大多数不等式都是用锐常数得到的。

英文摘要:

In this paper, we investigate cylindrical extensions of critical Sobolev type (improved Hardy) inequalities and identities in the style of Badiale-Tarantello [BT02], which in a special case give a critical Hardy inequality and its stability results. We also obtain higher-order identities, which interestingly include well-known numbers like double factorial, Oblong numbers, and Stirling numbers of the second kind. All functional identities are obtained in $L^{p}$ for $p\in (1,\infty)$ without the real-valued function assumption, which gives a simple and direct understanding of the corresponding inequalities as well as the nonexistence of nontrivial extremizers. As applications, we obtain Caffarelli-Kohn-Nirenberg type inequalities with logarithmic weights, which in a particular case give the critical case of the Heisenberg-Pauli-Weyl type uncertainty principle. We also discuss these results in the setting of Folland and Stein's homogeneous Lie groups. A special focus is devoted to stratified Lie groups, where Sobolev type inequalities become intricately intertwined with the properties of sub-Laplacians and more general subelliptic partial differential equations. The obtained results are already new even in the classical Euclidean setting with respect to the range of parameters and the arbitrariness of the choice of any homogeneous quasi-norm. Most inequalities are obtained with sharp constants.

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