New Grand Unified Models with Intersecting D6-branes, Neutrino Masses, and Flipped SU(5)

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dc.creatorCvetic, Mirjam
dc.creatorLangacker, Paul
dc.date2006-07-31
dc.date2006-08-01
dc.date.accessioned2026-07-07T10:42:30Z
dc.date.available2026-07-07T10:42:30Z
dc.descriptionWe construct new supersymmetric SU(5) Grand Unified Models based on Z4 x Z2 orientifolds with intersecting D6-branes. Unlike constructions based on Z2 x Z2 orientifolds, the orbifold images of the three-cycles wrapped by D6-branes correspond to new configurations and thus allow for models in which, in addition to the chiral sector in 10 and 5-bar representations of SU(5), only, there can be new sectors with (15 + 15-bar) and (10 + 10-bar) vector-pairs. We construct an example of such a globally consistent, supersymmetric model with four-families, two Standard Model Higgs pair-candidates and the gauge symmetry U(5) x U(1) x Sp(4). In a N = 2 sector, there are 5 x (15 + 15-bar) and 1 x (10 + 10-bar) vector pairs, while another N = 1 sector contains one vector-pair of 15-plets. The N = 2 vector pairs can obtain a large mass dynamically by parallel D6-brane splitting in a particu- lar two-torus. The 15-vector-pairs provide, after symmetry breaking to the Standard Model (via parallel D-brane splitting), triplet pair candidates which can in principle play a role in generating Majorana- type masses for left-handed neutrinos, though the necessary Yukawa couplings are absent in the specific construction. Similarly, the 10- vector-pairs can play the role of Higgs fields of the flipped SU(5), though again there are phenomenological difficulties for the specific construction.
dc.description38 pages, 2 figures Minor corrections, references added
dc.identifierhttps://arxiv.org/abs/hep-th/0607238
dc.identifierhttp://arxiv.org/abs/hep-th/0607238
dc.identifierNucl.Phys.B776:118-137,2007
dc.identifierdoi:10.1016/j.nuclphysb.2007.03.008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181970
dc.subjectHigh Energy Physics - Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNew Grand Unified Models with Intersecting D6-branes, Neutrino Masses, and Flipped SU(5)
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