Maximal subspace averages
Maximal subspace averages
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最大子空间平均值
DOI:
10.1016/j.aim.2022.108749
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发表时间:
2022
影响因子:
1.7
通讯作者:
Parissis, Ioannis
中科院分区:
文献类型:
--
作者:
Di Plinio, Francesco;Parissis, Ioannis
We consider maximal operators associated to singular averages along finite subsets Σ of the Grassmannian Gr (d, n) of d-dimensional subspaces of R n. The well studied d= 1 case corresponds to the directional maximal function with respect to arbitrary finite subsets of Gr (1, n)= S n− 1. We provide a systematic study of all cases 1≤ d< n and prove essentially sharp L 2 (R n) bounds for the maximal subspace averaging operator in terms of the cardinality of Σ, with no assumption on the structure of Σ. In the codimension 1 case, that is n= d+ 1, we prove the precise critical weak (2, 2)-bound. Drawing on the analogy between maximal subspace averages and (d, n)-Nikodym maximal averages, we also formulate the appropriate maximal Nikodym conjecture for general 1< d< n by providing examples that determine the critical L p-space for the (d, n)-Nikodym problem. Unlike the d= 1 case, the maximal Kakeya and Nikodym problems are shown not to be equivalent when d> 1. In this context, we prove the best possible L 2 (R n)-bound for the (d, n)-Nikodym maximal function for all combinations of dimension and codimension. Our estimates rely on Fourier analytic almost orthogonality principles, combined with polynomial partitioning, but we also use spatial analysis based on the precise calculation of intersections of d-dimensional plates in R n.
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影响因子:
0.9
作者:
C. Demeter
通讯作者:
C. Demeter
DOI:
10.1017/s0305004100056681
发表时间:
1980
影响因子:
0.8
作者:
K. Falconer
通讯作者:
K. Falconer
DOI:
10.1007/bf02386043
发表时间:
1977
期刊:
Arkiv för Matematik
影响因子:
--
作者:
J. Strömberg
通讯作者:
J. Strömberg
影响因子:
0.8
作者:
Sal Barone;S. Basu
通讯作者:
S. Basu
影响因子:
4.9
作者:
A. Córdoba
通讯作者:
A. Córdoba