A Solution to the Doublet-Triplet Splitting Problem in the Type IIB Supergravity

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dc.creatorWatari, T.
dc.creatorYanagida, T.
dc.date2002-08-11
dc.date.accessioned2026-07-07T03:47:48Z
dc.date.available2026-07-07T03:47:48Z
dc.descriptionThe doublet--triplet mass splitting problem is one of the most serious problems in supersymmetric grand unified theories (GUTs). A class of models based on a product gauge group, such as the SU(5)_{GUT} times U(3)_H or the SU(5)_{GUT} times U(2)_H, realize naturally the desired mass splitting that is protected by an unbroken R symmetry. It has been pointed out that various features in the models suggest that these product-group unification models are embedded in a supersymmetric brane world. We show an explicit construction of those models in the supersymmetric brane world based on the Type IIB supergravity in ten dimensions. We consider T^6/(Z_{12} times Z_2) orientifold for the compactified six extra dimensions. We find that all of the particles needed for the GUT-symmetry-breaking sector are obtained from the D-brane fluctuations. The three families of quarks and leptons are introduced at an orbifold singularity, although their origin remains unexplained. This paper includes extensive discussion on anomaly cancellation in a given orbifold geometry. Relation to the Type IIB string theory, realization of R symmetry as a rotation of extra-dimensional space, and effective superpotential at low energies are also discussed.
dc.description61 pages
dc.identifierhttps://arxiv.org/abs/hep-ph/0208107
dc.identifierhttp://arxiv.org/abs/hep-ph/0208107
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/41760
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleA Solution to the Doublet-Triplet Splitting Problem in the Type IIB Supergravity
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