  We investigate dilaton stabilization in a higher-dimensional theory. The
background geometry is based on an eleven-dimensional Kaluza-Klein/supergravity
model, which is assumed to be a product of four-dimensional de Sitter (dS_4)
spacetime and a seven sphere. The dilaton potential has a local minimum
resulting from contributions of the cosmological constant, the curvature of the
internal spacetime and quantum effects of the background scalar, vector,
spinor, and tensor fields. The dilaton settles down to the local minimum, and
the scale of the extra dimensions eventually become time independent. Our
four-dimensional universe evolves from dS_4 into AdS_4 after stabilization of
the extra dimension.
