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arXiv 1003.5072math.PR
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高斯核的维数相关超压缩性

Dimension dependent hypercontractivity for Gaussian kernels

Dominique Bakry, François Bolley, Ivan Gentil

摘要:

我们得到了一类扩散半群的马尔可夫核的尖锐的、局部的和维数依赖的超压缩界。与无维的,他们捕捉马尔可夫核的精细属性,如跟踪估计。它们意味着经典的界限上的Ornstein-Uhlenbeck半群和一个尺寸和细化(运输)Talagrand不等式时,应用到Hamilton-Jacobi方程。研究了由非扩散Lévy半群驱动的Ornstein-Uhlenbeck半群的超压缩界.曲率-尺寸准则是分析的主要工具。

英文摘要:

We derive sharp, local and dimension dependent hypercontractive bounds on the Markov kernel of a large class of diffusion semigroups. Unlike the dimension free ones, they capture refined properties of Markov kernels, such as trace estimates. They imply classical bounds on the Ornstein-Uhlenbeck semigroup and a dimensional and refined (transportation) Talagrand inequality when applied to the Hamilton-Jacobi equation. Hypercontractive bounds on the Ornstein-Uhlenbeck semigroup driven by a non-diffusive Lévy semigroup are also investigated. Curvature-dimension criteria are the main tool in the analysis.

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