Complexified Gravity in Noncommutative Spaces

Details Complexified Gravity in Noncommutative Spaces Complexified Gravity in Noncommutative Spaces

2000-05-24

arxiv.org/abs/hep-th/0005222v2

Commun.Math.Phys. 218 (2001) 283-292

Physics

High Energy Physics

High Energy Physics - Theory

13 pages. References added

Scientific paper

10.1007/s002200100393

The presence of a constant background antisymmetric tensor for open strings or D-branes forces the space-time coordinates to be noncommutative. This effect is equivalent to replacing ordinary products in the effective theory by the deformed star product. An immediate consequence of this is that all fields get complexified. The only possible noncommutative Yang-Mills theory is the one with U(N) gauge symmetry. By applying this idea to gravity one discovers that the metric becomes complex. We show in this article that this procedure is completely consistent and one can obtain complexified gravity by gauging the symmetry $U(1,D-1)$ instead of the usual $SO(1,D-1)$. The final theory depends on a Hermitian tensor containing both the symmetric metric and antisymmetric tensor. In contrast to other theories of nonsymmetric gravity the action is both unique and gauge invariant. The results are then generalized to noncommutative spaces.

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