Factorization of the 3d superconformal index

Abstract

We prove that 3d superconformal index for general $$ \mathcal{N} $$ = 2 U(N) gauge group with fundamentals and anti-fundmentals with/without Chern-Simons terms is factorized into vortex and anti-vortex partition function. We show that for simple cases, 3d vortex partition function coincides with a suitable topological open string partition function. We provide much more elegant derivation at the index level for $$ \mathcal{N} $$ = 2 Seiberg-like dualities of unitary gauge groups with fundamantal matters and $$ \mathcal{N} $$ = 4 mirror symmetry