A characterization of sub-riemannian spaces as length dilatation structures constructed via coherent projections

Details A characterization of sub-riemannian spaces as length dilatation structures constructed via coherent projections A characterization of sub-riemannian spaces as length dilatation structures constructed via coherent projections

2008-10-28

arxiv.org/abs/0810.5042v4

Communications in Mathematical Analysis 11, no 2, pp 70-111 (2011)

Mathematics

Differential Geometry

extended introduction and final discussion

Scientific paper

We introduce length dilatation structures on metric spaces, tempered dilatation structures and coherent projections and explore the relations between these objects and the Radon-Nikodym property and Gamma-convergence of length functionals. Then we show that the main properties of sub-riemannian spaces can be obtained from pairs of length dilatation structures, the first being a tempered one and the second obtained via a coherent projection. Thus we get an intrinsic, synthetic, axiomatic description of sub-riemannian geometry, which transforms the classical construction of a Carnot-Caratheodory distance on a regular sub-riemannian manifold into a model for this abstract sub-riemannian geometry.

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