# 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}
}
• Published 27 June 2011
• Mathematics
• Nuclear Physics
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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