Janus Configurations , Chern-Simons Couplings , And The θ-Angle in N = 4 Super Yang-Mills Theory

@inproceedings{GaiottoJanusC,
  title={Janus Configurations , Chern-Simons Couplings , And The θ-Angle in N = 4 Super Yang-Mills Theory},
  author={Davide Gaiotto and Edward H Witten}
}
We generalize the half-BPS Janus configuration of four-dimensional N = 4 super Yang-Mills theory to allow the theta-angle, as well as the gauge coupling, to vary with position. We show that the existence of this generalization is closely related to the existence of novel three-dimensional Chern-Simons theories with N = 4 supersymmetry. Another closely related problem, which we also elucidate, is the D3-NS5 system in the presence of a four-dimensional theta-angle. 
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