Aspects of Stability and Phenomenology in Type IIA Orientifolds with Intersecting D6-branes

Abstract

Intersecting branes have been the subject of string model building for several years. This work introduces in detail the toroidal and Z_N-orientifolds, where the main discussion employs the picture of intersecting D6-branes. The derivation of the R-R and NS-NS tadpole cancellation conditions in CFT is shown in detail. Various aspects of the massless spectrum are discussed, involving spacetime anomalies, the generalized Green-Schwarz mechanism and possible gauge breaking mechanisms. Both N=1 SUSY and non-SUSY approaches to low energy model building are treated. Firstly, the problem of complex structure instabilities in toroidal OmegaR-orientifolds is approached by a Z_3-orbifolded model, including a stable non-SUSY 3-generation standard-like model. It descends naturally from a flipped SU(5) GUT. Secondly, supersymmetric models on the Z_4-orbifold are discussed, involving exceptional 3-cycles and the explicit construction of fractional D-branes. A three generation Pati-Salam model that even can be broken down to a MSSM-like model is constructed as an example, involving non-flat and non-factorizable branes. Finally, the possibility that unstable closed and open string moduli could play the role of the inflaton is being explored. In the closed string sector, the slow-rolling requirement can only be fulfilled for very specific cases, where some moduli are frozen and a special choice of coordinates is taken. In the open string sector, inflation is not possible at all.

171 pages, PhD thesis, ref. added

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• Chiral Supersymmetric Standard Model Spectra from Orientifolds of Gepner Models
• Getting just the Supersymmetric Standard Model at Intersecting Branes on the Z6-orientifold
• Brane world effective actions for D-branes with fluxes
• Effective Action and Soft Supersymmetry Breaking for Intersecting D-brane Models
• A Supersymmetric Flipped SU(5) Intersecting Brane World
• Scherk-Schwarz Breaking and Intersecting Branes
• Some Phenomenology of Intersecting D-Brane Models
• Chiral N=1 4d Orientifolds with D-branes at Angles
• Constructing the supersymmetric Standard Model from intersecting D6-branes on the Z_6' orientifold
• Type IIA orientifolds and orbifolds on non-factorizable tori
• A Stronger Case for Superunification Post Higgs Boson Discovery
• Catching the phantom: the MSSM on the Z6-orientifold
• Connecting String/M Theory to the Electroweak Scale and to LHC Data
• Classification of BPS equations in higher dimensions
• A new picture for 4-dimensional 'spacetime' from intersecting D-branes on the T^9