Cwikel-Solomyak estimates on tori and Euclidean spaces

Abstract

We revise Cwikel-type estimate for the singular values of the operator $(1-\Delta_{\mathbb{T}^d})^{-\frac{d}{4}}M_f(1-\Delta_{\mathbb{T}^d})^{-\frac{d}{4}}$ on the torus $\mathbb{T}^d$ for the ideal $\mathcal{L}_{1,\infty}$, established by M.Z. Solomyak in even dimensions in \cite{Solomyak1995}, and extend it to odd dimensions. We obtain a new result for (symmetrized) Cwikel type estimates for Laplacians on $\mathbb{R}^d$ for arbitrary positive integer $d.$