On the stability of a soft-wall model

Details On the stability of a soft-wall model On the stability of a soft-wall model

2010-08-10

arxiv.org/abs/1008.1632v2

Phys. Rev. D 82, 075009 (2010)

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 1 figure; references added

Scientific paper

10.1103/PhysRevD.82.075009

We investigate the stability and fluctuations of a soft wall model that has an asymptotically AdS metric and a scalar field that has an asymptotically power-law dependence in the conformal coordinate. By imposing UV boundary conditions, the soft wall mass scale can be fixed to be near the TeV scale and causes the radion to no longer be massless. A hierarchy between the weak scale and the Planck scale can be generated for various particle spectrum behavior, although natural values only occur for a gravitational sector containing scalar fields that act like unparticles. In addition, if bulk Standard Model fields have nonstandard couplings to the gravitational sector, then a discrete particle spectrum can be realized in the nongravitational sector. This allows for the possibility of an unparticle solution to the hierarchy problem.

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