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• W2964166820 endingPage "4147" @default.
• W2964166820 startingPage "4115" @default.
• W2964166820 abstract "A 3D almost-Riemannian manifold is a generalized Riemannian manifold defined locally by 3 vector fields that play the role of an orthonormal frame, but could become collinear on some set $mathcal{Z}$ called the singular set. Under the Hörmander condition, a 3D almost-Riemannian structure still has a metric space structure, whose topology is compatible with the original topology of the manifold. Almost-Riemannian manifolds were deeply studied in dimension 2. In this paper we start the study of the 3D case which appears to be richer with respect to the 2D case, due to the presence of abnormal extremals which define a field of directions on the singular set. We study the type of singularities of the metric that could appear generically, we construct local normal forms and we study abnormal extremals.We then study the nilpotent approximation and the structure of the corresponding small spheres. We finally give some preliminary results about heat diffusion on such manifolds." @default.
• W2964166820 created "2019-07-30" @default.
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• W2964166820 creator A5061850292 @default.
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• W2964166820 date "2015-01-01" @default.
• W2964166820 modified "2023-09-23" @default.
• W2964166820 title "Local properties of almost-Riemannian structures in dimension 3" @default.
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• W2964166820 doi "https://doi.org/10.3934/dcds.2015.35.4115" @default.
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