  The high degeneracy of KK modes in models which have bulk axions moving in
some extra, compact dimensions which are larger than O (Angstrom)strongly
tightens the supernova upper bounds on the axion photon coupling making axions
practically unobservable. Conversely, discovering axions directly or indirectly
will exclude such models. These drastic conclusions are avoided if the
supernova and bounds from solar axion searches are relaxed.
