SU(5) grand unified theory
= SU(5) grand unified theory
{c}
An SU(5) grand unified theory embeds $SU(3)_c\times SU(2)_L\times U(1)_Y$ into $SU(5)$. Canonical normalization of its hypercharge generator predicts $g_s^2=g_w^2=(5/3)g_Y^2$ at the unification scale.