Scotogenic model from an extended electroweak symmetry

We argue that the higher weak isospin S U ( 3 ) L manifestly unifies dark matter and normal matter in its isomultiplets for which dark matter carries a conserved dark charge while normal matter does not. The resultant gauge symmetry is given by S U ( 3 ) C ⊗ S U ( 3 ) L ⊗ U ( 1 ) X ⊗ U ( 1 ) G , where the first factor is the color group, while the rest defines a scotoelectroweak theory in which X and G determine electric charge Q = T 3 − 1 / 3 T 8 + X and dark charge D = − 2 / 3 T 8 + G . This setup provides both appropriate scotogenic neutrino masses and dark matter stability as preserved by a residual dark parity P D = ( − 1 ) D . Interpretation of the dark charge is further discussed, given that S U ( 3 ) L is broken at very high energy scale.