2024/10/31 by Gioacchino Antonelli, Robert Young, Antonelli, Gioacchino +2
Mathematics · Medicine · #Advanced Neuroimaging Techniques and Applications #Geology #Geometry #Group (periodic table) #Heisenberg group #Mathematical analysis #Mathematics #Physics #Quantum mechanics #math.DG #math.MG
paper · pdf · doi:10.48550/arxiv.2411.00232
openalex publication_date 2024/10/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Let ℍ denote the three-dimensional Heisenberg group. In this paper, we study vertical curves in ℍ and fibers of maps ℍ → ℝ2 from a metric perspective. We say that a set in ℍ is a vertical curve if it satisfies a cone condition with respect to a homogeneous cone with axis ⟨ Z ⟩, the center of ℍ. This is analogous to the cone condition used to define intrinsic Lipschitz graphs. In the first part of the paper, we prove that connected vertical curves are locally biHölder equivalent to intervals. We also show that the class of vertical curves coincides with the class of intersections of intrinsic Lipschitz graphs satisfying a transversality condition. Unlike intrinsic Lipschitz graphs, the Hausdorff dimension of a vertical curve can vary; we construct vertical curves with Hausdorff dimension either strictly larger or strictly smaller than 2. Consequently, there are intersections of intrinsic Lipschitz graphs with Hausdorff dimension either strictly larger or strictly smaller than 2. In the second part of the paper, we consider smooth functions β from the unit ball B in ℍ to ℝ2. We show that, in contrast to the situation in Euclidean space, there are maps such that β is arbitrarily close to the projection π from ℍ to the horizontal plane, but the average H2 measure of a fiber of β in B is arbitrarily small.