Nonsingular 4d-flat branes in six-dimensional supergravities

Details Nonsingular 4d-flat branes in six-dimensional supergravities Nonsingular 4d-flat branes in six-dimensional supergravities

2004-08-09

arxiv.org/abs/hep-th/0408063v2

JHEP0503:049,2005

Physics

High Energy Physics

High Energy Physics - Theory

13 pages. The discussion of modular invariance is amended and a reference has been added

Scientific paper

10.1088/1126-6708/2005/03/049

We show that six-dimensional supergravity models admit nonsingular solutions in the presence of flat three-brane sources with positive tensions. The models studied in this paper are nonlinear sigma models with the target spaces of the scalar fields being noncompact manifolds. For the particular solutions of the scalar field equations which we consider, only two brane sources are possible which are positioned at those points where the scalar field densities diverge, without creating a divergence in the Ricci scalar or the total energy. These solutions are locally invariant under 1/2 of D=6 supersymmetries, which, however, do not integrate to global Killing spinors. Other branes can be introduced by hand by allowing for local deficit angles in the transverse space without generating any kind of curvature singularities.

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