Topology of the Heisenberg group and H=W questions (I)

par Armin Shikorra (Universität Freiburg)

mardi 4 oct. 2016, 14:30 → 16:30 Europe/Paris

Auditoire CYCL08, bâtiment Marc de Hemptinne (Université Catholique de Louvain)

Approximation of Sobolev maps into Riemannian manifolds by smooth functions depends on the topology of the manifold. We report on recent progress of density questions for Sobolev maps into the Heisenberg group and related topological problems. The Heisenberg groups are examples of sub-Riemannian manifolds homeomorphic, but not diffeomorphic to the Euclidean space. Their metric is derived from curves which are only allowed to move in so-called horizontal directions.