A comment on the enhancement of global symmetries in superconformal SU(2) gauge theories in 5D

摘要: Recently, the superconformal index for a class of 5-dimensional quantum field theories with gauge group SU(2) and $N_f$ flavors was computed in Kim, Lee (2012) to few low orders chemical potential enhancement global symmetry $E_{N_f+1}$ confirmed this order. In note I provide an argument that information contained these order terms expansion is sufficient prove symmetries theories. So, particular expression indices must display all potential.