Spaces of nonpositive curvature arising from a finite algebra

Details Spaces of nonpositive curvature arising from a finite algebra Spaces of nonpositive curvature arising from a finite algebra

2009-08-26

arxiv.org/abs/0908.3725v1

Mathematics

Metric Geometry

22 pages

Scientific paper

In this paper we introduce a family of examples that can be regarded as spaces of nonpositive curvature, but with the distinct quality that they are not complete as metric spaces. This amounts to the fact that they are modelled on a finite von Neumann algebra, and the metrics introduced arise from the trace of the algebra. In spite of the noncompleteness of these manifolds, their geometry can be studied from the view-point of metric geometry, and several techniques derived from the functional analysis are applied to gain insight on their geodesic structure.

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