An intrinsic measure for submanifolds in stratified groups
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Valentino Magnani
Abstract
For each submanifold of a stratified group, we find a number and a measure only depending on its tangent bundle, the grading and the fixed Riemannian metric. In two step stratified groups, we show that such number and measure coincide with the Hausdorff dimension and with the spherical Hausdorff measure of the submanifold with respect to the Carnot-Carathéodory distance, respectively. Our main technical tool is an intrinsic blow-up at points of maximum degree. We also show that the intrinsic tangent cone to the submanifold at these points is always a subgroup. Finally, by direct computations in the Engel group, we show how our results can be extended to higher step stratified groups, provided the submanifold is sufficiently regular.
© Walter de Gruyter Berlin · New York 2008
Articles in the same Issue
- Automorphisms of free groups have asymptotically periodic dynamics
- Addition formulae over the Jacobian pre-image of hyperelliptic Wirtinger varieties
- Castelnuovo theory via Gröbner bases
- Additive higher Chow groups of schemes
- Seminormal forms and Gram determinants for cellular algebras
- The orbifold Chow ring of hypertoric Deligne-Mumford stacks
- An intrinsic measure for submanifolds in stratified groups
- Addendum to the paper: The Chow rings of G2 and Spin(7)
Articles in the same Issue
- Automorphisms of free groups have asymptotically periodic dynamics
- Addition formulae over the Jacobian pre-image of hyperelliptic Wirtinger varieties
- Castelnuovo theory via Gröbner bases
- Additive higher Chow groups of schemes
- Seminormal forms and Gram determinants for cellular algebras
- The orbifold Chow ring of hypertoric Deligne-Mumford stacks
- An intrinsic measure for submanifolds in stratified groups
- Addendum to the paper: The Chow rings of G2 and Spin(7)
