A novel braneworld model with a bulk scalar field

Details A novel braneworld model with a bulk scalar field A novel braneworld model with a bulk scalar field

2005-07-28

arxiv.org/abs/hep-th/0507277v2

Phys.Lett.B623:244-250,2005; Erratum-ibid.B631:199,2005

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, 4 figures, replaced with corrections in the solution of hierarchy problem

Scientific paper

10.1016/j.physletb.2005.07.060 1

We consider a new braneworld model with a bulk scalar field coupled to gravity. The bulk scalar action is inspired by the proposed low energy effective action around the tachyon vacuum. A class of warped geometries representing solutions of this Einstein-scalar system for a specific scalar potential is found. The geometry is non singular with a decaying warp factor and a negative Ricci curvature. The solution of the hierarchy problem is obtained using this type of warping. Though qualitatively similar to the usual Randall--Sundrum I model there are interesting quantitative differences. Additionally, in the RS-II set up the graviton zero mode as well as spin half massless fermions are found to be localised on the brane.

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