In this paper we explain how to define “lower dimensional” volumes of any compact Riemannian manifold as the integrals of local Riemannian invariants. For instance we give sense to the area and the length of such a manifold in any dimension. Our reasoning is motivated by an idea of Connes and involves in an essential way noncommutative geometry and the analysis of Dirac operators on spin manifolds. However, the ultimate definitions of the lower dimensional volumes do not involve noncommutative geometry or spin structures at all.
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Ponge, R. Noncommutative Geometry and Lower Dimensional Volumes in Riemannian Geometry. Lett Math Phys 83, 19–32 (2008). https://doi.org/10.1007/s11005-007-0199-2
Mathematics Subject Classification (2000)
- Primary 58J42
- Secondary 53B20
- Noncommutative geometry
- local Riemannian geometry
- pseudodifferential operators