Year: 2026
Type: preprint
Abstract: We study a weighted Fourier capacity attached to compact sets, $ c_{p,k}(K)=\inf\left\{\|k\widehat u\|_{L^p(\mathbb{R}^d)}:u\in C_0^\infty(\mathbb{R}^d),\ u\geq 1 \text{ on } K\right\},$ where $k$ is a positive tempered weight. The paper develops complementary upper and lower estimates for this quantity. The upper bounds are obtained from Frostman data, Fourier restriction estimates, and Bessel-potential majorants, which together provide admissible smooth majorants of the compact set. The lower bounds follow from a dual testing argument against positive measures supported on $K$, yielding estimates in terms of the weighted $L^{p'}$ size of their Fourier transforms. For sets of positive Lebesgue measure, testing with $χ_K\,\mathrm{d}x$ connects the capacity with the weighted integrability of $\widehat{χ_K}$. A Lebedev-type Sobolev criterion then gives non-triviality ranges governed by the upper Minkowski dimension of $\partial K$ and the growth of the weight. We also record consequences for Ahlfors-David regular sets and positive-measure Cantor-type examples.
Source: arXiv (Cornell University)
Authors: Leon, Rodrigo, Vergara, Vicente
Institution: University of Concepción
Language: English
Subfield: Applied Mathematics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222548548