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D-branes at Singularities, Compactification, and Hypercharge

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arxiv hep-th/0610007 v2 pith:PDJSH4GY submitted 2006-10-02 hep-th

Matthew Buican , Dmitry Malyshev , David R. Morrison , Martijn Wijnholt , Herman Verlinde This is my paper
classification hep-th
keywords singularitycalabi-yaucompactconstructiond-branesgaugehyperchargethreefold
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We report on progress towards the construction of SM-like gauge theories on the world-volume of D-branes at a Calabi-Yau singularity. In particular, we work out the topological conditions on the embedding of the singularity inside a compact CY threefold, that select hypercharge as the only light U(1) gauge factor. We apply this insight to the proposed open string realization of the SM of hep-th/0508089, based on a D3-brane at a dP_8 singularity, and present a geometric construction of a compact Calabi-Yau threefold with all the required topological properties. We comment on the relevance of D-instantons to the breaking of global U(1) symmetries.

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  1. Testing F-theory GUTs with the Axiverse

    hep-th 2026-06 unverdicted novelty 6.0 of 10

    In F-theory GUTs, non-universal ALPs induced by hypercharge flux satisfy g_aγ/m_a well below the QCD axion prediction when gauge couplings unify near the string scale.

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