Lower bounds for uncentered maximal functions in any dimension

2016/02/18 by Ivanisvili, Paata, Jaye, Benjamin, Nazarov, Fedor
#42B20 #42B35 #47A30 #Analysis of PDEs (math.AP) #FOS: Mathematics

paper · doi:10.48550/arxiv.1602.05895

Abstract

In this paper we address the following question: given p∈ (1,∞), n ≥ 1, does there exists a constant A(p,n)>1 such that ‖ M f‖_L^p≥ A(n,p) ‖ f‖_L^p for any nonnegative f ∈ L^p(ℝⁿ), where Mf is a maximal function operator defined over the family of shifts and dilates of a centrally symmetric convex body. The inequality fails in general for the centered maximal function operator, but nevertheless we give an affirmative answer to the question for the uncentered maximal function operator and the almost centered maximal function operator. In addition, we also present the Bellman function approach of Melas, Nikolidakis and Stavropoulos to maximal function operators defined over various types of families of sets, and in case of parallelepipeds we will show that A(n,p)=((p)/(p-1))^1/p.

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