  We present the study of a two 3-branes system embedded in a 5-dimensional
space-time in which the fifth dimension is compacted on a $S^{1}/Z_{2}$
orbifold and the space between the two branes is vacuum. Assuming isotropic and
homogeneous space time, we probe that the dynamics of the visible brane is
affected by the dynamics of the hidden brane and the possible components which
fills it. We study two different cases: assuming a constant equation of state
and inflationary scalar field, and its possible consequences in the brane
evolution.
