The dynamics of a stabilized radion in the Randall-Sundrum model with two b
ranes is investigated, and the effects of the radion on electroweak precisi
on observables are evaluated. The radius is assumed to he stabilized using
a bulk scalar field as suggested by Goldberger and Wise. First the mass and
the wave function of the radion is determined including the back reaction
of the bulk stabilization field on the metric, giving a typical radion mass
of the order of the weak scale. This is demonstrated by a perturbative com
putation of the radion wave function. A consequence of the background confi
guration for the scalar field is that after including the back reaction the
Kaluza-Klein slates of the bulk scalars couple directly to the standard mo
del 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 th
eory approach. In the absence of a curvature-scalar Higgs mixing operator,
these corrections are small and give a negative contribution to S. In the p
resence of such a mixing operator, however, the corrections can be sizable
due to the modified Higgs and radion couplings.