Dimensional reduction of gauge theories yielding unified models spontaneously broken to SU3xSU2xU1

By dimensional reduction of pure gauge theories (with gauge group G) over a compact coset space S/R, one obtains four-dimensional theories where scalar fields and a symmetry breaking potential appear naturally. We present an analysis of all such unified models with simple G which are spontaneously broken to SU3xSU2xU1, and which can be obtained by this technique with the added restriction that S is contained in G. Although the bosonic sectors appear promising, no cases are found with the correct quantum numbers for the surviving fermions. (orig.)