Mathematics > Metric Geometry
[Submitted on 25 Jun 2018 (v1), last revised 17 Jan 2022 (this version, v3)]
Title:Blowups and blowdowns of geodesics in Carnot groups
View PDFAbstract:This paper provides some partial regularity results for geodesics (i.e., isometric images of intervals) in arbitrary sub-Riemannian and sub-Finsler manifolds. Our strategy is to study infinitesimal and asymptotic properties of geodesics in Carnot groups equipped with arbitrary sub-Finsler metrics. We show that tangents of Carnot geodesics are geodesics in some groups of lower nilpotency step. Namely, every blowup curve of every geodesic in every Carnot group is still a geodesic in the group modulo its last layer. Then as a consequence we get that in every sub-Riemannian manifold any $s$ times iterated tangent of any geodesic is a line, where $s$ is the step of the sub-Riemannian manifold in question. With a similar approach, we also show that blowdown curves of geodesics in sub-Riemannian Carnot groups are contained in subgroups of lower rank. This latter result is also extended to rough geodesics.
Submission history
From: Eero Hakavuori [view email][v1] Mon, 25 Jun 2018 10:43:43 UTC (32 KB)
[v2] Fri, 5 Oct 2018 09:25:16 UTC (35 KB)
[v3] Mon, 17 Jan 2022 12:19:05 UTC (81 KB)
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