https://doi.org/10.1140/epjc/s2005-02443-2
Theoretical Physics
Generalized gauge theories with nonunitary parallel transport: * General relativity with cosmological constant as an example
II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
* e-mail: gerhard.mack@desy.de
Received:
31
August
2005
Published online:
14
February
2006
In gauge theories parallel transporters (PTs) 
along paths C play an important role. Traditionally they are unitary or pseudoorthogonal maps between vector spaces. We propose to abandon unitarity of parallel transporters and with it the a priori assumption of metricity in general relativity. A *-operation on parallel transporters serves as a substitute for it, and this *-operation is proven to be unique on group theoretical grounds. The vierbein and the spin connection appear as distinguishable parts of a single de Sitter gauge field with field strength F. The action takes the form 
and both the Einstein field equations with arbitrarily small but nonvanishing cosmological constant Λ and the condition of vanishing torsion are obtained from it. The equation of motion for classical massive bodies turns out to be de Sitter covariant.
© Springer-Verlag, 2006
