Boundaries for CAT(0) groups
In this thesis we construct a boundary δG for an arbitrary CAT(0) group G. This boundary is compact and invariant under group isomorphisms. It carries a canonical (possibly trivial) G-action by homeomorphisms. For each geometric action of G on a CAT(0) space X there exists a canonical G-equivariant...
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ndltd-bl.uk-oai-ethos.bl.uk-3993722018-09-25T03:27:29ZBoundaries for CAT(0) groupsIniotakis, Jan-Mark2003In this thesis we construct a boundary δG for an arbitrary CAT(0) group G. This boundary is compact and invariant under group isomorphisms. It carries a canonical (possibly trivial) G-action by homeomorphisms. For each geometric action of G on a CAT(0) space X there exists a canonical G-equivariant continuous map T : δG → δX. If G is a word-hyperbolic CAT(0) group, its boundary δG coincides with the usual Gromov boundary. If G is free abelian of rank k, its boundary is homeomorphic to the sphere Sk-1. For product groups of the types G X Zk and G x H, where G and H are non-elementary word-hyperbolic CAT(0) groups, the boundary is worked out explicitly. Finally, we prove that the marked length spectrum associated to a geometric action of a torsion-free word-hyperbolic group on a CAT(0) space determines the isometry type of the CAT(0) space up to an additive constant.512.2QA MathematicsUniversity of Warwickhttps://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399372http://wrap.warwick.ac.uk/105031/Electronic Thesis or Dissertation |
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512.2 QA Mathematics |
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512.2 QA Mathematics Iniotakis, Jan-Mark Boundaries for CAT(0) groups |
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In this thesis we construct a boundary δG for an arbitrary CAT(0) group G. This boundary is compact and invariant under group isomorphisms. It carries a canonical (possibly trivial) G-action by homeomorphisms. For each geometric action of G on a CAT(0) space X there exists a canonical G-equivariant continuous map T : δG → δX. If G is a word-hyperbolic CAT(0) group, its boundary δG coincides with the usual Gromov boundary. If G is free abelian of rank k, its boundary is homeomorphic to the sphere Sk-1. For product groups of the types G X Zk and G x H, where G and H are non-elementary word-hyperbolic CAT(0) groups, the boundary is worked out explicitly. Finally, we prove that the marked length spectrum associated to a geometric action of a torsion-free word-hyperbolic group on a CAT(0) space determines the isometry type of the CAT(0) space up to an additive constant. |
author |
Iniotakis, Jan-Mark |
author_facet |
Iniotakis, Jan-Mark |
author_sort |
Iniotakis, Jan-Mark |
title |
Boundaries for CAT(0) groups |
title_short |
Boundaries for CAT(0) groups |
title_full |
Boundaries for CAT(0) groups |
title_fullStr |
Boundaries for CAT(0) groups |
title_full_unstemmed |
Boundaries for CAT(0) groups |
title_sort |
boundaries for cat(0) groups |
publisher |
University of Warwick |
publishDate |
2003 |
url |
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399372 |
work_keys_str_mv |
AT iniotakisjanmark boundariesforcat0groups |
_version_ |
1718742166119907328 |