Preprints and Publications

Part of this material is based upon work supported by the National Science Foundation under Grant No. 0405032 and CAREER Grant No. 0644613 as well as by the Swiss National Funds Grant PA002-101406 and the French CNRS ANR grant JC_318197 QuantiT. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF). Nor those of the Swiss National Funds or of the CNRS I suppose, although I didn't check with them and they didn't ask me to write that.

Joint with A. Iozzi and T. Fernos: The Median Class and Superrigidity of Actions on CAT(0) Cube Complexes. Preprint 2012.
Joint with Y. de Cornulier, G. Mislin and Ch. Pittet: Bounded characteristic classes and flat bundles
To appear in Journal of differential geometry.
Joint with G. Mislin: On transfer in bounded cohomology. Preprint 2009.
Joint with T.N. Venkataramana, Discrete Linear Groups containing Arithmetic Groups. Preprint 2009.
To appear in Transformation groups.
Joint with G. Mislin, Ch. Pittet and L. Saloff-Coste: On the bounded cohomology for connected Lie groups. Preprint 2009 Published in Math. Annalen Volume 351, Issue 3 (2011), Page 541-569 under the new title A geometric criterion for the boundedness of characteristic classes.
Joint with M. Kassabov: New examples of finitely presented groups with strong fixed point properties.
Journal of Topology and Analysis, vol. 1, No. 1 (2009), 1 - 12.
Joint with C. Drutu and F. Haglund: Kazhdan and Haagerup properties from the median viewpoint.
Adv. of Math. Volume 225, Issue 2 (2010), 882 - 921.
Joint with J. Berrick and G. Mislin: Homotopy idempotents and Bass' conjectures.
Geometry & Topology Monographs 10 (2006), 41 - 62.
Joint with G. Mislin: Traces and reduced group C*algebras..
Contemporary Mathematics AMS 2006, Volume 209, 73 - 86.
Joint with G. Niblo: A characterization of hyperbolic spaces.
Groups, Geometry and Dynamics, Volume 1, Issue 3 (2007) 281 - 299.
Joint with Ch. Pittet and L. Saloff-Coste: Connected Lie groups and property RD.
Duke Mathematical Journal, vol. 137, No 3 (2007), 511 - 536.
Twisted Rapid Decay. Appendix to Mathai's Heat kernels and the range of the trace on completions of twisted group algebras.
Contemporary Mathematics, vol. 398 (2006) 321 - 346.
Joint with G. Mislin: Hattori-Stallings trace and Euler characteristics for groups.
London Math. Soc. Lecture Note Series, Vol 358 (2009), 256 - 271.
Joint with K. Ruane: Some geometric groups with Rapid Decay.
GAFA 15, Number 2 (2005), 311 - 339.
Joint with G. Niblo: From wall spaces to CAT(0) cube complexes.
International Journal of Algebra and Computation, Vol. 15, Nos. 5 & 6 (2005), 875 - 885.
Joint with G. Mislin: Atiyah's L²-Index Theorem.
L'enseignement Mathématique 49 (2003), 85 - 93.
Joint with J. Berrick and G. Mislin: From acyclic groups to the Bass conjecture for amenable groups.
Math. Annalen 329, Number 4 (2004), 597 - 621 .
Property (RD) for cocompact lattices in a finite product of rank one Lie groups with some rank two Lie groups.
Geometriae Dedicata 96 (2003), 161 - 177.
On property (RD) for certain discrete groups.
Ph.D. Thesis, September 2001, Zürich.
Advisors: Prof. A. Valette (University of Neuchâtel) and Prof. M. Burger (ETH Zürich, FIM).
External referee: Prof. F. Paulin (ENS Paris).
Sur deux points de cohomologie l². M. Sc. Thesis, January 1997, University of Lausanne. Advisor: Prof. M. Burger.

Pedagogical work

Spring 1999: Script for the graduate course given by A. Valette: Introduction to the Baum-Connes conjecture.
Lectures in Mathematics ETH Zürich, Birkhäuser Verlag, Basel, 2002. With an appendix by G. Mislin.

April 2002: C*-algebras and K-theory, in the Bernstein Seminar at Cornell.

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