Universal Aspects of Gravity Localized on Thick Branes

Details Universal Aspects of Gravity Localized on Thick Branes Universal Aspects of Gravity Localized on Thick Branes

2000-01-07

arxiv.org/abs/hep-th/0001033v2

Nucl.Phys.B581:309-338,2000

Physics

High Energy Physics

High Energy Physics - Theory

31 pages, 6 figures, latex, JHEP.cls, amsmath, epsf.sty. Comment on the Lykken-Randall scenario added. Minor changes and refer

Scientific paper

10.1016/S0550-3213(00)00271-6

We study gravity in backgrounds that are smooth generalizations of the Randall-Sundrum model, with and without scalar fields. These generalizations include three-branes in higher dimensional spaces which are not necessarily Anti-de Sitter far from the branes, intersecting brane configurations and configurations involving negative tension branes. We show that under certain mild assumptions there is a universal equation for the gravitational fluctuations. We study both the graviton ground state and the continuum of Kaluza-Klein modes and we find that the four-dimensional gravitational mode is localized precisely when the effects of the continuum modes decouple at distances larger than the fundamental Planck scale. The decoupling is contingent only on the long-range behaviour of the metric from the brane and we find a universal form for the corrections to Newton's Law. We also comment on the possible contribution of resonant modes. Given this, we find general classes of metrics which maintain localized four-dimensional gravity. We find that three-brane metrics in five dimensions can arise from a single scalar field source, and we rederive the BPS type conditions without any a priori assumptions regarding the form of the scalar potential. We also show that a single scalar field cannot produce conformally-flat locally intersecting brane configurations or a p-brane in greater than (p+2)-dimensions.

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