Abstract
We provide the first explicit example of Type IIB string theory compactification on a globally defined Calabi-Yau threefold with torsion which results in a four-dimensional effective theory with a non-Abelian discrete gauge symmetry. Our example is based on a particular Calabi-Yau manifold, the quotient of a product of three elliptic curves by a fixed point free action of \( {\mathbb{Z}}_2\times {\mathbb{Z}}_2 \). Its cohomology contains torsion classes in various degrees. The main technical novelty is in determining the multiplicative structure of the (torsion part of) the cohomology ring, and in particular showing that the cup product of second cohomology torsion elements goes non-trivially to the fourth cohomology. This specifies a non-Abelian, Heisenberg-type discrete symmetry group of the cfour-dimensional theory.
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Braun, V., Cvetič, M., Donagi, R. et al. Type II string theory on Calabi-Yau manifolds with torsion and non-Abelian discrete gauge symmetries. J. High Energ. Phys. 2017, 129 (2017). https://doi.org/10.1007/JHEP07(2017)129
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DOI: https://doi.org/10.1007/JHEP07(2017)129