Modular and duality properties of surface operators in N=2* gauge theories

Feb 9, 2017
54 pages
Published in:
  • JHEP 07 (2017) 068
  • Published: Jul 14, 2017
e-Print:

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Abstract: (Springer)
We calculate the instanton partition function of the four-dimensional N=2 \mathcal{N}={2}^{\star } SU(N) gauge theory in the presence of a generic surface operator, using equivariant localization. By analyzing the constraints that arise from S-duality, we show that the effective twisted superpotential, which governs the infrared dynamics of the two-dimensional theory on the surface operator, satisfies a modular anomaly equation. Exploiting the localization results, we solve this equation in terms of elliptic and quasi-modular forms which resum all non-perturbative corrections. We also show that our results, derived for monodromy defects in the four-dimensional theory, match the effective twisted superpotential describing the infrared properties of certain two-dimensional sigma models coupled either to pure N=2 \mathcal{N}=2 or to N=2 \mathcal{N}={2}^{\star } gauge theories.
Note:
  • 51 pages, v3: references added, typos fixed, footnote added, some small changes in the text, appendix B streamlined. Matches the published version
  • Duality in Gauge Field Theories
  • Extended Supersymmetry
  • Supersymmetry and Duality
  • D-branes
  • operator: surface
  • superpotential: twist
  • gauge field theory: SU(N)
  • instanton: partition function
  • localization
  • infrared