Non-geometric Calabi-Yau backgrounds and K3 automorphisms

Abstract : We consider compactifications of type IIA superstring theory on mirror-folds obtained as K3 fibrations over two-tori with non-geometric monodromies involving mirror symmetries. At special points in the moduli space these are asymmetric Gepner models. The compactifications are constructed from non-geometric automorphisms that arise from the diagonal action of an automorphism of the K3 surface and of an automorphism of the mirror surface. We identify the corresponding gaugings of N = 4 supergravity in four dimensions, and show that the minima of the potential describe the same four-dimensional low-energy physics as the worldsheet formulation in terms of asymmetric Gepner models. In this way, we obtain a class of Minkowski vacua of type II string theory which preserve N = 2 supersymmetry. The massless sector consists of N = 2 supergravity coupled to 3 vector multiplets, giving the STU model. In some cases there are additional massless hypermultiplets.
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Journal of High Energy Physics, Springer, 2017, pp.084. 〈10.1007/JHEP11(2017)084〉
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C. Hull, D. Israël, A. Sarti. Non-geometric Calabi-Yau backgrounds and K3 automorphisms. Journal of High Energy Physics, Springer, 2017, pp.084. 〈10.1007/JHEP11(2017)084〉. 〈hal-01651614〉

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