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Multilinear generalized Radon transforms and point configurations

  • Loukas Grafakos EMAIL logo , Allan Greenleaf , Alex Iosevich and Eyvindur Palsson
Published/Copyright: September 24, 2013

Abstract

We study multilinear generalized Radon transforms using a graph-theoretic paradigm that includes the widely studied linear case. These provide a general mechanism to study Falconer-type problems involving (k+1)-point configurations in geometric measure theory, with k ≥ 2, including the distribution of simplices, volumes and angles determined by the points of fractal subsets E ⊂ ℝd, d ≥ 2. If Tk(E) denotes the set of noncongruent (k+1)-point configurations determined by E, we show that if the Hausdorff dimension of E is greater than d - (d-1)/(2k), then the k+12-dimensional Lebesgue measure of Tk(E) is positive. This complements previous work on the Falconer conjecture ([Int. Math. Res. Not. IMRN 23 (2005), 1411–1425] and the references there), as well as work on finite point configurations [Recent Advances in Harmonic Analysis and Applications, Springer-Verlag, New York (2013), 93–103; Anal. PDE 5 (2012), no. 2, 397–409]. We also give applications to Erdős-type problems in discrete geometry and a fractal regular value theorem, providing a multilinear framework for the results in [Adv. Math. 228 (2011), 2385–2402].

MSC: 42B15; 05D05

Funding source: NSF

Award Identifier / Grant number: DMS 0900946

Funding source: NSF

Award Identifier / Grant number: DMS 0853892

Funding source: NSF

Award Identifier / Grant number: DMS 1045404

We would like to thank an anonymous referee for recommending expository improvements.

Received: 2013-8-1
Published Online: 2013-9-24
Published in Print: 2015-7-1

© 2015 by De Gruyter

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