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Non-supersymmetric heterotic model building. (English) Zbl 1333.81315
Summary: We investigate orbifold and smooth Calabi-Yau compactifications of the non-supersymmetric heterotic $$\mathrm{SO}(16)\times \mathrm{SO}(16)$$ string. We focus on such Calabi-Yau backgrounds in order to recycle commonly employed techniques, like index theorems and cohomology theory, to determine both the fermionic and bosonic 4D spectra. We argue that the $$N=0$$ theory never leads to tachyons on smooth Calabi-Yaus in the large volume approximation. As twisted tachyons may arise on certain singular orbifolds, we conjecture that such tachyonic states are lifted in the full blow-up. We perform model searches on selected orbifold geometries. In particular, we construct an explicit example of a Standard Model-like theory with three generations and a single Higgs field.

##### MSC:
 81T30 String and superstring theories; other extended objects (e.g., branes) in quantum field theory 14J81 Relationships with physics 14J32 Calabi-Yau manifolds (algebro-geometric aspects)
##### Keywords:
strings and branes phenomenology
Orbifolder
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