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We study the radion stability and radion mass in the framework of theHorava-Witten (HW) heterotic M-Theory on $S^{1}/Z_{2}$, and find that theradion is stable and its mass can be of the order of GeV. The gravity islocalized on the visible brane, and the spectrum of the gravitationalKaluza-Klein (KK) modes is discrete and can have a mass gap of TeV. Thecorrections to the 4D Newtonian potential from the higher order gravitationalKK modes are exponentially suppressed. Applying such a setup to cosmology, wefind the generalized Friedmann-like equations on each of the two orbifoldbranes.

Brane cosmology in the Horava-Witten heterotic M-Theory on $S^{1}/Z_{2}$