Radion Dynamics and Electroweak Physics

Abstract

The dynamics of a stabilized radion in the Randall-Sundrum model (RS) with two branes is investigated, and the effects of the radion on electroweak precision observables are evaluated. The radius is assumed to be stabilized using a bulk scalar field as suggested by Goldberger and Wise. First the mass and the wavefunction of the radion is determined including the backreaction of the bulk stabilization field on the metric, giving a typical radion mass of order the weak scale. This is demonstrated by a perturbative computation of the radion wavefunction. A consequence of the background configuration for the scalar field is that after including the backreaction the Kaluza-Klein (KK) states of the bulk scalars couple directly to the Standard Model fields on the TeV brane. Some cosmological implications are discussed, and in particular it is found that the shift in the radion at late times is in agreement with the four-dimensional effective theory result. The effect of the radion on the oblique parameters is evaluated using an effective theory approach. In the absence of a curvature-scalar Higgs mixing operator, these corrections are small and give a negative contribution to S. In the presence of such a mixing operator, however, the corrections can be sizable due to the modified Higgs and radion couplings.

42 pages, LaTeX, 14 figures; v2: minor changes and references added. To appear in PRD

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