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arXiv 0911.4563math.APmath.FA
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一般测度的分数Poincaré不等式

Fractional Poincaré inequalities for general measures

Clément Mouhot, Emmanuel Russ, Yannick Sire

摘要:

我们在$\R^n$中证明了一个分数阶的Poincaré不等式,并赋予它一个相当一般的测度.即我们证明了非局部量对$L^2$范数的控制,该非局部量在标准庞加莱不等式中扮演梯度的角色。对测度的假设是它满足经典的Poincaré不等式,因此我们的结果是后者不等式的改进。此外,我们还量化了在无穷大的重量增长方面的分数阶导数的控制提供的紧密性。证明通过介绍的生成元的Ornstein-Uhlenbeck半群和一些仔细估计其权力。据我们所知,这是第一次证明分数庞加莱不等式的措施更普遍比Lévy措施。

英文摘要:

We prove a fractional version of Poincaré inequalities in the context of $\R^n$ endowed with a fairly general measure. Namely we prove a control of an $L^2$ norm by a non local quantity, which plays the role of the gradient in the standard Poincaré inequality. The assumption on the measure is the fact that it satisfies the classical Poincaré inequality, so that our result is an improvement of the latter inequality. Moreover we also quantify the tightness at infinity provided by the control on the fractional derivative in terms of a weight growing at infinity. The proof goes through the introduction of the generator of the Ornstein-Uhlenbeck semigroup and some careful estimates of its powers. To our knowledge this is the first proof of fractional Poincaré inequality for measures more general than Lévy measures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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