Abstract
We classify su(N c ) gauge theories on \( {\mathrm{\mathbb{R}}}^3\times {\mathbb{S}}^1 \) with massless fermions in higher representations obeying periodic boundary conditions along \( {\mathbb{S}}^1 \). In particular, we single out the class of theories that is asymptotically free and weakly coupled in the infrared, and therefore, is amenable to semi-classical treatment. Our study is conducted by carefully identifying the vacua inside the affine Weyl chamber using Verma bases and Frobenius formula techniques. Theories with fermions in pure representations are generally strongly coupled. The only exceptions are the four-index symmetric representation of su(2) and adjoint representation of su(N c ). However, we find a plethora of admissible theories with fermions in mixed representations. A sub-class of these theories have degenerate perturbative vacua separated by domain walls. In particular, su(N c ) theories with fermions in the mixed representations adjoint⊕fundamental and adjoint⊕two-index symmetric admit degenerate vacua that spontaneously break the parity \( \mathcal{P} \), charge conjugation \( \mathcal{C} \), and time reversal \( \mathcal{T} \) symmetries. These are the first examples of strictly weakly coupled gauge theories on \( {\mathrm{\mathbb{R}}}^3\times {\mathbb{S}}^1 \) with spontaneously broken \( \mathcal{C} \), \( \mathcal{P} \), and \( \mathcal{T} \) symmetries. We also compute the fermion zero modes in the background of monopole-instantons. The monopoles and their composites (topological molecules) proliferate in the vacuum leading to the confinement of electric charges. Interestingly enough, some theories have also accidental degenerate vacua, which are not related by any symmetry. These vacua admit different numbers of fermionic zero modes, and hence, different kinds of topological molecules. The lack of symmetry, however, indicates that such degeneracy might be lifted by higher order corrections. Finally, we study the general phase structure of adjoint⊕fundamental theories in the small circle and decompactification limits.
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Anber, M.M., Vincent-Genod, L. Classification of compactified su(N c ) gauge theories with fermions in all representations. J. High Energ. Phys. 2017, 28 (2017). https://doi.org/10.1007/JHEP12(2017)028
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DOI: https://doi.org/10.1007/JHEP12(2017)028