Papers and Preprints by Udo Baumgartner

• Geometric characterization of flat groups of automorphisms
  (with Günter Schlichting and George A. Willis), submitted, 12 pages.
  pdf |  ArXiv:0807.5060 | abstract
  
  
• Hecke algebras from groups acting on trees and HNN extensions
  (with Jacqui Ramagge, Marcelo Laca and George A. Willis),
  accepted for publication by Journal of Algebra, 21 pages.
  pdf |  ArXiv:0805.3195 | abstract
  
  
• Contraction groups in complete Kac-Moody groups
  (with Jacqui Ramagge and Bertrand Rémy),
  Groups, Geometry, and Dynamics 2 (2008), no. 3, 337–352.
  published paper |  pdf |  ArXiv:0706.2713 | abstract
  
  
• Scales for co-compact embeddings of virtually free groups
  Geometriae Dedicata 130 (2007), no. 1, 163–175.
  published paper | pdf |  ArXiv:math.GR/0604151 | abstract
  
  
• Flat rank of automorphism groups of buildings
  (with Bertrand Rémy and George A. Willis), Transform. Groups 12 (2007), no. 3, 413–436.
  published paper | pdf |  ArXiv:math.GR/0510290 | abstract
  
  
• Totally disconnected, locally compact groups as geometric objects — A survey of work in progress
  in Geometric Group Theory — Geneva and Barcelona Conferences
  G.N. Arzhantseva, L. Bartholdi, J. Burillo and E. Ventura (Eds.)
  Trends in Mathematics, Birkhäuser Verlag 2007, 1–20.
  pdf |  abstract
  
  
• A compactly generated group whose Hecke algebras admit no bounds on their representations
  (with Jacqui Ramagge and George A. Willis), Glasgow Math. J. 48 (2006) 193–201.
  published paper | pdf | abstract
  
  
• The direction of an automorphism of a totally disconnected locally compact group
  (with George A. Willis), Math. Z. 252 (2006), no. 2, 393–428.
  published paper | pdf | abstract
  
  
• Hecke algebras of group extensions
  (with James Foster, Jacqueline Hicks, Helen Lindsay, Ben Maloney, Iain Raeburn , Jacqui Ramagge and Sarah Richardson)
  Comm. Algebra 33 (2005), 4135–4147.
  published paper | pdf | abstract
  
  
• Contraction groups and scales of automorphisms of totally disconnected locally compact groups
  (with George A. Willis), Israel J. Math. 142 (2004), 221–249.
  pdf | ArXiv:math.GR/0302095| abstract
  
  
• Cusps of lattices in rank 1 Lie groups over local fields
  Geom. Dedicata 99 (2003), 17–46.
  published paper | pdf | ArXiv:math.GR/0302111| abstract