paper

A topologically twisted index for three-dimensional supersymmetric theories

arXiv:1504.03698 · doi:10.1007/JHEP07(2015)127

Abstract

We provide a general formula for the partition function of three-dimensional gauge theories placed on with a topological twist along , which can be interpreted as an index for chiral states of the theories immersed in background magnetic fields. The result is expressed as a sum over magnetic fluxes of the residues of a meromorphic form which is a function of the scalar zero-modes. The partition function depends on a collection of background magnetic fluxes and fugacities for the global symmetries. We illustrate our formula in many examples of 3d Yang-Mills-Chern-Simons theories with matter, including Aharony and Giveon-Kutasov dualities. Finally, our formula generalizes to -backgrounds, as well as two-dimensional theories on and four-dimensional theories on . In particular this provides an alternative way to compute genus-zero A-model topological amplitudes and Gromov-Witten invariants.

59 pages + appendices; v2: refs added; v3: minor corrections, published version

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