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Flows and joins of metric spaces | | Igor Mineyev
; | | Date: |
14 Mar 2005 | | Journal: | Geom. Topol. 9(2005) 403-482 | | Subject: | Metric Geometry; Group Theory; Geometric Topology MSC-class: 20F65, 20F67, 37D40, 51F99, 57Q05, 57M07, 57N16, 57Q91, 05C25 | math.MG math.GR math.GT | | Abstract: | We introduce the functor * which assigns to every metric space X its symmetric join *X. As a set, *X is a union of intervals connecting ordered pairs of points in X. Topologically, *X is a natural quotient of the usual join of X with itself. We define an Isom(X)-invariant metric d* on *X. Classical concepts known for H^n and negatively curved manifolds are defined in a precise way for any hyperbolic complex X, for example for a Cayley graph of a Gromov hyperbolic group. We define a double difference, a cross-ratio and horofunctions in the compactification X-bar= X union bdry X. They are continuous, Isom(X)-invariant, and satisfy sharp identities. We characterize the translation length of a hyperbolic isometry g in Isom(X). For any hyperbolic complex X, the symmetric join *X-bar of X-bar and the (generalized) metric d* on it are defined. The geodesic flow space F(X) arises as a part of *X-bar. (F(X),d*) is an analogue of (the total space of) the unit tangent bundle on a simply connected negatively curved manifold. This flow space is defined for any hyperbolic complex X and has sharp properties. We also give a construction of the asymmetric join X*Y of two metric spaces. These concepts are canonical, i.e. functorial in X, and involve no `quasi’-language. Applications and relation to the Borel conjecture and others are discussed. | | Source: | arXiv, math.MG/0503274 | | Services: | Forum | Review | PDF | Favorites | |
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