With the goal of constructing the supersymmetric action for all fields,
massless and massive, obtained by Kaluza-Klein compactification from type II
theory or M-theory in a closed form, we embed the (Abelian) tensor hierarchy of
p-forms in four-dimensional, N=1 superspace and construct its Chern-Simons-like
invariants. When specialized to the case in which the tensors arise from a
higher-dimensional theory, the invariants may be interpreted as
higher-dimensional Chern-Simons forms reduced to four dimensions. As an
application of the formalism, we construct the eleven-dimensional Chern-Simons
form in terms of four-dimensional, N=1 superfields.Comment: 31 page