Steiner and tube formulae in 3D contact sub-Riemannian geometry
Differential Geometry
2023-07-13 v2 Metric Geometry
Abstract
We prove a Steiner formula for regular surfaces with no characteristic points in 3D contact sub-Riemannian manifolds endowed with an arbitrary smooth volume. The formula we obtain, which is equivalent to a half-tube formula, is of local nature. It can thus be applied to any surface in a region not containing characteristic points. We provide a geometrical interpretation of the coefficients appearing in the expansion, and compute them on some relevant examples in three-dimensional sub-Riemannian model spaces. These results generalize those obtained in 10.1016/j.na.2015.05.006 and arXiv:1703.01592v3 for the Heisenberg group.
Keywords
Cite
@article{arxiv.2302.01256,
title = {Steiner and tube formulae in 3D contact sub-Riemannian geometry},
author = {Davide Barilari and Tania Bossio},
journal= {arXiv preprint arXiv:2302.01256},
year = {2023}
}
Comments
31 pages. To appear in Communications in Contemporary Mathematics