Reference : Sub-Riemannian Geometry on Infinite-Dimensional Manifolds
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Mathematics
Sub-Riemannian Geometry on Infinite-Dimensional Manifolds
Grong, Erlend mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Mathematics Research Unit >]
Irina, Markina [Department of Mathematics > > University of Bergen]
Vasil'ev, Alexander [Department of Mathematics > > University of Bergen]
Journal of Geometric Analysis
Yes (verified by ORBilu)
[en] Sub-Riemannian geometry ; Infinite-dimensional manifold ; Semi-rigid curves
[en] We generalize the concept of sub-Riemannian geometry to infinite- dimensional manifolds modeled on convenient vector spaces. On a sub-Riemannian manifold M, the metric is defined only on a sub-bundle H of the tangent bundle T M, called the horizontal distribution. Similarly to the finite-dimensional case, we are able to split possible candidates for minimizing curves into two categories: semi-rigid curves that depend only on H, and normal geodesics that depend both on H itself and on the metric on H. In this sense, semi-rigid curves in the infinite-dimensional case generalize the notion of singular curves for finite dimensions. In particular, we study the case of regular Lie groups with invariant sub-Riemannian structure. As examples, we consider the group of sense-preserving diffeomorphisms Diff S1 of the unit circle and the Virasoro–Bott group with their respective horizontal distributions chosen to be the Ehresmann connections with respect to a projection to the space of normalized univalent functions. In these cases we prove controllability and find formulas for the normal geodesics with respect to the pullback of the invariant Kählerian metric on the class of normalized univalent functions. The geodesic equations are analogues to the Camassa–Holm, Hunter–Saxton, KdV, and other known non-linear PDE.
Fonds National de la Recherche - FnR
FnR ; FNR7628746 > Anton Thalmaier > GEOMREV > Geometry of random evolutions > 01/03/2015 > 28/02/2018 > 2014

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