NS5-branes and line bundles in heterotic/F-theory duality

@article{Braun2018NS5branesAL,
  title={NS5-branes and line bundles in heterotic/F-theory duality},
  author={A. Braun and Callum R. Brodie and A. Lukas and Fabian Ruehle},
  journal={Physical Review D},
  year={2018},
  volume={98},
  pages={126004}
}
We study F-theory duals of heterotic line bundle models on elliptically fibered Calabi-Yau threefolds. These models necessarily contain NS5-branes which are geometrized in the dual F-theory compactifications. We initiate a systematic study of the correspondence between various configurations of NS5-branes and the dual geometries in F-theory and perform several checks of the duality. Furthermore, we discuss the singular transitions between different configurations of NS5-branes. 
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