Let MOn-2k(BO(2k+1))(k a nonnegative integer) be the unoriented cobordism group of real(2k+1)-plane bundles over closed smooth(n-2k)-dimensional manifolds.
Let MO_n be an unoriented cobordism group, MO_n(BO(k+1)) an unoriented cobordism group of real (k+1)-plane bundles over closed smooth n-dimensional manifolds.
In the previous paper we have discussed the Kaluza type theories on the Minkowskian space-time M4 and the physical contents of various U1 gauge theories discribed by U1 principal bundles on M4 with an arbitrary scalar...