$L^p$-$L^q$ boundedness of Fourier multipliers on Fundamental domains of Lattices in ${\mathbb{R}}^d$

In this paper we study the $L^p$-$L^q$ boundedness of Fourier multipliers on the fundamental domain of a lattice in ${\mathbb{R}}^d$ for $1 < p,q < \infty$ under the classical H"ormander condition. First, we introduce Fourier analysis on lattices and have a look at possible generalisations. We then prove the Hausdorff-Young inequality, Paley’s inequality and the Hausdorff-Young-Paley inequality in the context of lattices. This amounts to a quantitative version of the $L^p$-$L^q$ boundedness of Fourier multipliers. Moreover, the Paley inequality allows us to prove the Hardy-Littlewood inequality.