SL(2,C) Gravity with Complex Vierbein and Its Noncommutative Extension

Details SL(2,C) Gravity with Complex Vierbein and Its Noncommutative Extension SL(2,C) Gravity with Complex Vierbein and Its Noncommutative Extension

2003-09-16

arxiv.org/abs/hep-th/0309166v2

Phys.Rev. D69 (2004) 024015

Physics

High Energy Physics

High Energy Physics - Theory

Minor corrections. The noncommutative action in section 3 is simplified. Version to appear in Physical Review D

Scientific paper

10.1103/PhysRevD.69.024015

We show that it is possible to formulate gravity with a complex vierbein based on SL(2,C) gauge invariance. The proposed action is a four-form where the metric is not introduced but results as a function of the complex vierbein. This formulation is based on the first order formalism. The novel feature here is that integration of the spin-connection gauge field gives rise to kinetic terms for a massless graviton, a massive graviton with the Fierz-Pauli mass term, and a scalar field. The resulting theory is equivalent to bigravity. We then show that by extending the gauge group to GL(2,C} the formalism can be easily generalized to apply to a noncommutative space with the star product. We give the deformed action and derive the Seiberg-Witten map for the complex vierbein and gauge fields.

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