We analyze the ultraviolet to infrared evolution and nonperturbative properties of asymptotically free ${ \rm SU}(N) \otimes { \rm SU}(N-4) \otimes { \rm U}(1)$ chiral gauge theories with $N_f$ copies of chiral fermions transforming according to $([2]_N,1)_{ N-4} + ([\bar 1]_N,[\bar 1]_{ N-4})_{ -(N-2)} + (1,(2)_{ N-4})_N$, where $[k]_N$ and $(k)_N$ denote the antisymmetric and symmetric rank-$k$ tensor representations of SU($N$) and the rightmost subscript is the U(1) charge. We give a detailed discussion for the lowest nondegenerate case, $N=6$. These theories can exhibit both self-breaking of a strongly coupled gauge symmetry and induced dynamical breaking of a weakly coupled gauge interaction symmetry due to fermion condensates produced by a strongly coupled gauge interaction. A connection with the dynamical breaking of ${ \rm SU}(2)_L \otimes { \rm U}(1)_Y$ electroweak gauge symmetry by the quark condensates $\langle \bar q q\rangle$ due to color SU(3)$_c$ interactions is discussed. We also remark on direct-product chiral gauge theories with fermions in higher-rank tensor representations.
Categories: hep-th hep-ph