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Sub-Riemannian sphere in Martinet flat case. (English) Zbl 0902.53033

The authors study the sub-Riemannian geometry \((\mathbb{R}^3, D,g)\), where \(D: y^2 dx=2dz\) is the Martinet distribution and \(g\) is an analytic Riemannian metric on \(D \). The metric \(g\) can be reduced to the flat case or to a one-parameter deformation of the flat case. In this context, the authors discover a parametrization of geodesics using elliptic integrals and derive the exponential map, the wave front, the conjugate and cut loci, the sub-Riemannian sphere, etc. An appendix contains numerical and graphical results concerning the conjugate locus and the sub-Riemannian sphere.

MSC:

53C22 Geodesics in global differential geometry
49L99 Hamilton-Jacobi theories
53C15 General geometric structures on manifolds (almost complex, almost product structures, etc.)

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