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#### Non-Geometric Vacua of the Spin(32)/ Z_2 Heterotic String and Little String Theories

##### MPS-Authors

Font,  Anamaría
AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

##### External Ressource
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##### Fulltext (public)

1708.05428.pdf
(Preprint), 550KB

JHEP11(2017)064.pdf
(Publisher version), 466KB

##### Supplementary Material (public)
There is no public supplementary material available
##### Citation

Font, A., & Mayrhofer, C. (2017). Non-Geometric Vacua of the Spin(32)/ Z_2 Heterotic String and Little String Theories. Journal of high energy physics: JHEP, 2017(11): 064. doi:10.1007/JHEP11(2017)064.

Cite as: http://hdl.handle.net/21.11116/0000-0000-64EA-8
##### Abstract
We study a class of 6d $\mathcal{N}=(1,0)$ non-geometric vacua of the $\text{Spin}(32)/\mathbb Z_2$ heterotic string which can be understood as fibrations of genus-two curves over a complex one-dimensional base. The 6d $\mathcal{N}=(1,0)$ theories living on the defects that arise when the genus-two fiber degenerates at a point of the base are analyzed by dualizing to F-theory on elliptic K3-fibered non-compact Calabi-Yau threefolds. We consider all possible degenerations of genus-two curves and systematically attempt to resolve the singularities of the dual threefolds. As in the analogous non-geometric vacua of the $E_8\times E_8$ heterotic string, we find that many of the resulting dual threefolds contain singularities which do not admit a crepant resolution. When the singularities can be resolved crepantly, we determine the emerging effective theories which turn out to be little string theories at a generic point on their tensor branch. We also observe a form of duality in which theories living on distinct defects are the same.