• “Symmetries and defects in 3d TFT”
  Talk (PDF) given at String-Math 2014 in Edmonton, Canada, June 2014. 
• “Large groups in mathematics, small scales in physics and a reason for finding integer numbers”
  Opening talk of the Bielefeld school in theoretical sciencies BGTS, November 2012. 
• “Gerbes on Lie groupoids”
  Talk (PDF) given at the CRCG workshop Higher Structures in Topology and Geometry IV in Göttingen, June 2010. 
• “Mapping class group representations and conformal boundary conditions”
  Talk (PDF) given at the workshop Lie algebras, vertex algebras and automorphic forms in Edinburgh, September 2009. 
• “The fundamental gerbe on a compact Lie group”
  Talk (PDF) given at the Seminar Sophus Lie in Göttingen, July 2009. 
• “Mathematik als Kulturleistung”
  Vortrag (PDF) und Folien (PDF) für den Vortrag beim Hamburger Wissenschaftsforum, November 2008 
• “Bundle gerbes and surface holonomy.”
  Talk (PDF) given at the European Congress of Mathematics (5ECM) in Amsterdam, July 2008. 
• “Bibranes: Target space geometry for worldsheet defects.”
  Talk (PDF) given at the conference on the occasion of Jürg Fröhlich's 61st birthday in Zurich, July 2007. 
• “Categorification and correlation functions in conformal field theory.”
  Talk (PDF) given at the International Congress of mathematicians (ICM) in Madrid, August 2006. 
• “Twining characters and orbit Lie algebras”
  Talk (PDF) at the workshop on Generalized Kac-Moody algebras (organizers P. Slodowy and R. Borcherds) at the Mathematisches Forschungsinstitut Oberwolfach, Germany. July 1998.

Publikationslisten

• Liste der Veröffentlichungen (PDF)
• Veröffentlichungen im arXiv
• Veröffentlichungen in Google Scholar

Bücher als Autor

    Download your free copy

List of typos

Bücher als Editor