• DOI:10.1088/1126-6708/2008/02/065
• Corpus ID: 15333801

Mirrorfolds with K3 fibrations

@article{Kawai2007MirrorfoldsWK,
  title={Mirrorfolds with K3 fibrations},
  author={Shinsuke Kawai and Yuji Sugawara},
  journal={Journal of High Energy Physics},
  year={2007},
  volume={2008},
  pages={065-065}
}

• Shinsuke Kawai, Y. Sugawara
• Published 7 November 2007
• Physics, Mathematics
• Journal of High Energy Physics

We study a class of non-geometric string vacua realized as completely soluble superconformal field theory (SCFT). These models are defined as `interpolating orbifolds' of K3 × S1 by the mirror transformation acting on the K3 fiber combined with the half-shift on the S1-base. They are variants of the T-folds, the interpolating orbifolds by T-duality transformations, and thus may be called `mirrorfolds'. Starting with arbitrary (compact or non-compact) Gepner models for the K3 fiber, we construct modular invariant partition functions of general mirrorfold models. In the case of compact K3 fiber the mirrorfolds only yield non-supersymmetric string vacua. They exhibit IR instability due to winding tachyon condensation which is similar to the Scherk-Schwarz type circle compactification. When the fiber SCFT is non-compact (say, the ALE space in the simplest case), on the other hand, both supersymmetric and non-supersymmetric vacua can be constructed. The non-compact non-supersymmetric mirrorfolds can get stabilised at the level of string perturbation theory. We also find that in the non-compact supersymmeric mirrorfolds D-branes are always non-BPS. These D-branes can get stabilized against both open- and closed-string marginal deformations.