Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-03-02
Nucl.Phys. B533 (1998) 199-209
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, uses harvmac.tex. Substantial additions made: proof of the vanishing of the 2-loop beta-functions for the N=1 models
Scientific paper
10.1016/S0550-3213(98)00495-7
Extending recent work of Kachru and Silverstein, we consider ``orbifolds'' of 4-dimensional $\CN=4$ SU(n) super-Yang-Mills theories with respect to discrete subgroups of the SU(4) $R$-symmetry which act nontrivially on the gauge group. We show that for every discrete subgroup of SU(4) there is a canonical choice of imbedding of the discrete group in the gauge group which leads to theories with a vanishing one-loop beta-function. We conjecture that these give rise to (generically non-supersymmetric) conformal theories. The gauge group is $\otimes_i SU(Nn_i)$ where $n_i$ denote the dimension of the irreducible representations of the corresponding discrete group; there is also bifundamental matter, dictated by associated quiver diagrams. The interactions can also be read off from the quiver diagram. For SU(3) and SU(2) subgroups this leads to superconformal theories with $\CN=1$ and $\CN=2$ respectively. In the $\CN=1$ case we prove the vanishing of the beta functions to two loops.
Lawrence Andy
Nekrasov Nikita
Vafa Cumrun
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