Comments on worldsheet description of the Omega background

@article{Nakayama2011CommentsOW,
  title={Comments on worldsheet description of the Omega background},
  author={Yu Nakayama and Hirosi Ooguri},
  journal={Nuclear Physics},
  year={2011},
  volume={856},
  pages={342-359}
}
Nekrasovʼs partition function is defined on a flat bundle of R^4 over S^1 called the Omega background. When the fibration is self-dual, the partition function is known to be equal to the topological string partition function, which computes scattering amplitudes of self-dual gravitons and graviphotons in type II superstring compactified on a Calabi–Yau manifold. We propose a generalization of this correspondence when the fibration is not necessarily self-dual. 
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