Pseudo-3-Branes in a Curved 6D Bulk

Details Pseudo-3-Branes in a Curved 6D Bulk Pseudo-3-Branes in a Curved 6D Bulk

2007-09-06

arxiv.org/abs/0709.0873v1

Phys.Lett.B656:112-118,2007

Physics

High Energy Physics

High Energy Physics - Theory

13 pages

Scientific paper

10.1016/j.physletb.2007.09.016

We consider a model involving a 4-brane in a 6D bulk which carries sigma model fields. An axion field on the 4-brane cancels the pressure along one direction leading to an effective codimension-2 3-brane. For a range of parameters of the theory, we get a transverse space which is non-compact, providing a possible solution to the cosmological constant problem. A setup with two branes in a compact space is also treated. In this case, a mild fine-tuning between the radii of the two 4-branes is necessary. Finally, we explore the 4-brane problem in the Gauss-Codazzi formulation and we discuss general aspects of gravity in the presence of additional brane sources.

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