Soft-Wall Stabilization

Details Soft-Wall Stabilization Soft-Wall Stabilization

2009-07-30

arxiv.org/abs/0907.5361v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 6 figures, 1 table. v2: references added, version to appear in NJP Focus Issue on Extra Dimensions

Scientific paper

We propose a general class of five-dimensional soft-wall models with AdS metric near the ultraviolet brane and four-dimensional Poincar\'e invariance, where the infrared scale is determined dynamically. A large UV/IR hierarchy can be generated without any fine-tuning, thus solving the electroweak/Planck scale hierarchy problem. Generically, the spectrum of fluctuations is discrete with a level spacing (mass gap) provided by the inverse length of the wall, similar to RS1 models with Standard Model fields propagating in the bulk. Moreover two particularly interesting cases arise. They can describe: (a) a theory with a continuous spectrum above the mass gap which can model unparticles corresponding to operators of a CFT where the conformal symmetry is broken by a mass gap, and; (b) a theory with a discrete spectrum provided by linear Regge trajectories as in AdS/QCD models.

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