We provide a general formula for the partition function of three-dimensional (formula presented) gauge theories placed on S2 ×S1 with a topological twist along S2, 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 Ω-backgrounds, as well as two-dimensional theories on S2 and four-dimensional theories on S2 × T2. In particular this provides an alternative way to compute genus-zero A-model topological amplitudes and Gromov-Witten invariants.
|Titolo:||A topologically twisted index for three-dimensional supersymmetric theories|
|Autori:||Benini, F; Zaffaroni, A.|
|Rivista:||JOURNAL OF HIGH ENERGY PHYSICS|
|Data di pubblicazione:||2015|
|Digital Object Identifier (DOI):||10.1007/JHEP07(2015)127|
|Appare nelle tipologie:||1.1 Journal article|