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Connecting Mirror Symmetry in 3d and 2d via Localization

We explicitly apply localization results to study the interpolation between three and two dimensional mirror symmetry for Abelian gauge theories with four supercharges. We first use the ellipsoid S_b^3 partition functions to verify the mirror symmetry between a pair of general three dimensional N=2 Abelian Chern-Simons quiver gauge theories. These expressions readily factorize into holomorphic blocks and their anti-holomorphic copies, so we can also obtain the partition functions on S^1 x S^2 via fusion procedure. We then demonstrate S^1 x S^2 partition functions for the three dimensional Abelian gauge theories can be dimensionally reduced to the S^2 partition functions of N=(2,2) GLSM and Landau-Ginzburg model for the corresponding two dimensional mirror pair, as anticipated previously in \cite{Aganagic:2001uw}. We also comment on the analogous interpolation for the non-Abelian gauge theories and compute the K-theory vortex partition function for a simple limit to verify the prediction from holomorphic block.