  We have examined the localization of gauge bosons on the three-brane embedded
in 5D bulk space-time, and we find two kinds of branes on which both graviton
and gauge bosons can be trapped. One is the dS brane with a positive
cosmological constant, and the other is the one with zero cosmological constant
or 4D Minkowski brane. Then, which brane is realized would depend on the
observation of the cosmological constant of our world.
