SU(5) unified theories from intersecting branes | Zendy

Minos Axenides | Zendy; E.G. Floratos | Zendy; Christos Kokorelis | Zendy

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SU(5) unified theories from intersecting branes

Author(s) -

Minos Axenides,

E.G. Floratos,

Christos Kokorelis

Publication year - 2003

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2003/10/006

Subject(s) - proton decay , physics , dilaton , particle physics , tadpole (physics) , moduli , discrete symmetry , extra dimensions , grand unified theory , gauge group , theoretical physics , electroweak interaction , gauge symmetry , scalar (mathematics) , brane cosmology , gauge theory , string theory , supersymmetry , quantum mechanics , geometry , homogeneous space , mathematics

We discuss the first string theory examples of three generationnon-supersymmetric SU(5) and {\em flipped} SU(5) GUTS, which break to theStandard model at low energy, without extra matter and/or gauge group factors.Our GUT examples are based on IIA $Z_3$ orientifolds with D6-branesintersecting at non-trivial angles. These theories necessarily satisfy RRtadpoles and are free of NSNS tadpoles as the complex structure moduli arefrozen (even though a dilaton tadpole remains) to discrete values. We identifyappropriately the bifundamental Higgses responsible for electroweak symmetrybreaking. In this way, the neutrino see-saw mechanism get nicely realized inthese constructions. Moreover, as baryon number is not a gauged symmetry gaugemediated dimension six operators do contribute to proton decay; however protonlifetime may be safely enhanced by appropriately choosing a high GUT scale. Anaccompanying natural doublet-triplet splitting guarantees the suppression ofscalar mediated proton decay modes and the stability of triplet scalar massesagainst higher dimensional non-renormalizable operators.Comment: 26 pages, 5 figures; no changes, one comment added in the introductio

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