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arXiv · 2607.18010

Quantitative Fourier decay for Patterson-Sullivan measures of dimension larger than $1/2$

Félix Lequen·Tuomas Sahlsten
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Abstract

We give an elementary proof of power Fourier decay for Patterson-Sullivan measures associated to convex co-compact Schottky groups of dimension $\delta>\frac12$, obtaining the explicit decay exponent $\frac{\delta(2\delta - 1)}{(2\delta + 1)(3 - \delta)}$. The proof replaces the technical machinery used in previous works, such as sum-product estimates, renewal theory, Dolgopyat methods, and $L^2$ flattening, by elementary oscillatory integral estimates, hyperbolic geometry, and a duality argument based on the transpose Schottky group.

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Félix Lequen, Tuomas Sahlsten. 2026-07-20. Quantitative Fourier decay for Patterson-Sullivan measures of dimension larger than $1/2$. https://arxiv.org/abs/2607.18010

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