论文信息 - Regularity and Continuity properties of the sub-Riemannian exponential map

Regularity and Continuity properties of the sub-Riemannian exponential map

We prove a version of Warner’s regularity and continuity properties for the subRiemannian exponential map. The regularity property is established by considering sub-Riemannian Jacobi fields while the continuity property follows from studying the Maslov index of Jacobi curves. We finally show how this implies that the exponential map of the three dimensional Heisenberg group is not injective in any neighbourhood of a conjugate vector. Keywords— Conjugate points, Sub-Riemannian geometry, Metric geometry MSC (2020)— 53C17, 53B15, 53B99, 49J15

Wilhelm Klingenberg | Samuel Borza

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