Letter: A Model of Gravitation with Global U(1)-symmetry

It is shown that an embedding of the generalrelativity 4-space into a flat 12-space gives a model ofgravitation with the global U(1)-symmetry and thediscrete D₁-one. The last one may betransformed into the SU(2)-symmetry of the unified model,and the demand of independence of U(1) andSU(2)-transformations leads to the estimatesin²_min = 0, 20 where_min is an analog of the Weinberg angle of thestandard model.