Localization and dimension free estimates for maximal functions

来源 :Harmonic Analysis and Applications(2014调和分析及其应用学术会议) | 被引量 : 0次 | 上传用户:w370724
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In a recent paper,A.Naor and T.Tao have introduced a new class of measures with a so-called micro-doubling property.Using martingale theory and probability methods,they are able to prove a localization theorem for the associated maximal functions.As a consequence they obtain a weak type estimate in a general abstract setting for these maximal functions that is reminiscent of the n log n result of Stein and Stromberg in Euclidean spaces.The purpose of this talk is twofold.First we introduce a new localization principle that localizes not only in the time-dilation parameter but also in space.The proof uses standard covering lemmas and selection processes.Second,we show that a uniform condition for micro-doubling in the Euclidean spaces provides indeed dimension free estimates for their maximal functions in all Lp with p > 1.This is done introducing a new technique that allows to differentiate through dimensions.
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