Incidence estimates for quasi-product sets and applications

Abstract

We use recent advances in the theory of Furstenberg sets to prove new incidence results of Szemerédi--Trotter strength for $\delta$-discretized structures with Cartesian product flavor. We use these results to make progress on a number of problems that include energy estimates and Fourier decay of fractal measures supported on curves, as well as various sum-product-like results governed by fractal dimension.

Setup/notation in subsection 4.3 overlaps with that in arXiv:2406.06884v1