  In view of the recent observations showing that the universe is accelerating
we discuss dilaton and radion stabilization from a phenomenological perspective
using perfect fluid sources. One general conclusion we present is that the
pressure coefficient along extra dimensions should be -2 if that of the
observed dimensions is -1, the latter mimicking a cosmological constant
compatible with experimental data. The conditions on the dilaton coupling are
similarly strong: we find that if the coupling of the dilaton $\phi$ to fields
other than gravity is of the form $\sqrt{-g}\;e^{(a-2)\phi}\;\mathcal{L}$ where
$\mathcal{L}$ representing all other fields yielding the mentioned fluid, $a$
must be -2 if space-time dimensionality is 10. Within our approach these
conditions result taking constant radion and dilaton at the level of the
equations of motion. To ameliorate this we also discuss how dynamical
stabilization may be achieved with a simple variant in which a dilaton
potential is added in the picture where the mentioned constraints are shown to
remain.
