Pure and Applied Analysis
- Pure Appl. Anal.
- Volume 2, Number 1 (2020), 75-92.
Sparse bounds for the discrete spherical maximal functions
We prove sparse bounds for the spherical maximal operator of Magyar, Stein and Wainger. The bounds are conjecturally sharp, and contain an endpoint estimate. The new method of proof is inspired by ones by Bourgain and Ionescu, is very efficient, and has not been used in the proof of sparse bounds before. The Hardy–Littlewood circle method is used to decompose the multiplier into major and minor arc components. The efficiency arises as one only needs a single estimate on each element of the decomposition.
Pure Appl. Anal., Volume 2, Number 1 (2020), 75-92.
Received: 8 April 2019
Accepted: 5 July 2019
First available in Project Euclid: 13 December 2019
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Kesler, Robert; Lacey, Michael T.; Mena, Darío. Sparse bounds for the discrete spherical maximal functions. Pure Appl. Anal. 2 (2020), no. 1, 75--92. doi:10.2140/paa.2020.2.75. https://projecteuclid.org/euclid.paa/1576206323