  Decoherence of Friedmann-Robertson-Walker (FRW) geometries due to massive
vector fields with $SO(3)$ global symmetry is discussed in the context of
Quantum Cosmology. (Talk presented at the 3rd National Meeting of Astronomy and
Astrophysics, July 1993, IST, Lisboa, Portugal. -- A more complete version will
be presented at MG7 conference and in the report CERN-TH.7241/94 DAMTP R-94/22
by the same authors)
