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加权范数不等式、非对角估计与椭圆算子。第II部分:齐型空间上的非对角估计

Weighted norm inequalities, off-diagonal estimates and elliptic operators. Part II: Off-diagonal estimates on spaces of homogeneous type

Pascal Auscher, José Maria Martell

摘要:

这是第二部分的一系列四篇文章的加权范数不等式,非对角估计和椭圆算子。我们考虑一个替代的概念点态界限的核心运营商,这通常是一个措施的衰减。这种替代是用局部和尺度不变的$L^p-L^q$估计表示的非对角估计。我们提出了一个定义在齐型空间是稳定的组合。它特别适合于半群。我们研究了由椭圆算子生成的半群的情形。

英文摘要:

This is the second part of a series of four articles on weighted norm inequalities, off-diagonal estimates and elliptic operators. We consider a substitute to the notion of pointwise bounds for kernels of operators which usually is a measure of decay. This substitute is that of off-diagonal estimates expressed in terms of local and scale invariant $L^p-L^q$ estimates. We propose a definition in spaces of homogeneous type that is stable under composition. It is particularly well suited to semigroups. We study the case of semigroups generated by elliptic operators.

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