Generalized Proca Equations and Vacuum Current from Breaking of   Ue(1)xUg(1) Gauge Symmetry
  Withdrawn: A short-proof of the non-existence of quartic terms in the Lagrangian of Ue(1)xUg(1) is given in the Addendum of hep-th/0601166 (Europhys.Lett.85:59901,2009). 
P. Castelo Ferreira and J. T. Mendonca