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arXiv 0803.1021math.AP
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Carnot群中的几何二阶导数估计与凸性

Geometric second derivative estimates in Carnot groups and convexity

Nicola Garofalo

摘要:

本文证明了Carnot群G中有界光滑区域Ω边界上为零的H_2-凸函数的一些新的先验估计。这样的估计是全局的并且本质上是几何的,因为它们涉及Ω的边界的水平平均曲率\mathcal H。作为我们的界的结果,我们证明了:如果G有第二步,则对于Ω \subset中的任何光滑$H_2$ -凸函数G,当G在Ω的边界上消失时,有\sum_{i,j=1}^m \int_Ω([X_i,X_j]u)^2 dg \leq {4/3} \int_{\partial Ω} \mathcal H| \nabla_H使用|^2 dσ_H。

英文摘要:

We prove some new a priori estimates for H_2-convex functions which are zero on the boundary of a bounded smooth domain Ωin a Carnot group G. Such estimates are global and are geometric in nature as they involve the horizontal mean curvature \mathcal H of the boundary of Ω. As a consequence of our bounds we show that if G has step two, then for any smooth $H_2$-convex function in Ω\subset G vanishing on the boundary of Ωone has \sum_{i,j=1}^m \int_Ω([X_i,X_j]u)^2 dg \leq {4/3} \int_{\partial Ω} \mathcal H |\nabla_H u|^2 dσ_H .

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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