Loomis-Whitney inequalities on Reiter-Heisenberg groups

RESUMO

We establish a Loomis-Whitney inequality for the Reiter-Heisenberg groups $\mathbb{G}_{qp}$, a family of step-two Carnot groups that includes the Heisenberg groups when $q=1$. The proof is based on the duality between Brascamp-Lieb inequalities and entropy subadditivity: we first derive the result for $\mathbb{G}_{q1}$ from the known inequality on the first Heisenberg group, using conditional entropy and the invariance of differential entropy under volume-preserving diffeomorphisms; then we pass from $\mathbb{G}_{q1}$ to $\mathbb{G}_{qp}$ via a stability principle for Loomis-Whitney inequalities under finite central sums, which generalizes the argument in (Zhang, 2024 arXiv:2402.02749v2 ). As consequences, we obtain the associated geometric projection inequality, a Gagliardo-Nirenberg-Sobolev inequality, and an isoperimetric inequality.