title: Geometry of mass.
abstract: We study the effect of mass on geometric descriptions of gauge field theories. In an approach in which the massless theory resembles general relativity, the introduction of the mass entails non-zero torsion and the generalization to Einstein-Cartan-Sciama-Kibble theories. The relationships to pure torsion formulations (teleparallel gravity) and to higher gauge theories are also discussed.
authors.affiliation: Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, 80333 München, Germany Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt am Main, Germany dietrich@th.physik.uni-frankfurt.de.
authors.forename: D D
authors.initials: DD
authors.lastname: Dietrich
keywords: gauge field theory; geometry; mass; torsion