SU(5) D-brane realizations, Yukawa couplings and proton stability
arXiv:1010.5188 · doi:10.1007/JHEP12(2010)011
Abstract
We discuss SU(5) Grand Unified Theories in the context of orientifold compactifications. Specifically, we investigate two and three D-brane stack realizations of the Georgi-Glashow and the flipped SU(5) model and analyze them with respect to their Yukawa couplings. As pointed out in arXiv:0909.0271 the most economical Georgi-Glashow realization based on two stacks generically suffers from a disastrous large proton decay rate. We show that allowing for an additional U(1) D-brane stack this as well as other phenomenological problems can be resolved. We exemplify with globally consistent Georgi-Glashow models based on RCFT that these D-brane quivers can be indeed embedded in a global setting. These globally consistent realizations admit rigid O(1) instantons inducing the perturbatively missing coupling 10105^H. Finally we show that flipped SU(5) D-brane realizations even with multiple U(1) D-brane stacks are plagued by severe phenomenological drawbacks which generically cannot be overcome.
34 pages v2 minor corrections
References in corpus (35)
- Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
- Spacetime Instanton Corrections in 4D String Vacua - The Seesaw Mechanism for D-Brane Models
- Neutrino Majorana Masses from String Theory Instanton Effects
- GUTs in Type IIB Orientifold Compactifications
- Stringy Instantons and Quiver Gauge Theories
- Progress in D-brane model building
- Orientifolds, hypercharge embeddings and the Standard Model
- Instanton Induced Neutrino Majorana Masses in CFT Orientifolds with MSSM-like spectra
- Non-perturbative Yukawa Couplings from String Instantons
- Stringy Instantons at Orbifold Singularities
- Computation of D-brane instanton induced superpotential couplings - Majorana masses from string theory
- D-brane Instantons on the T^6/Z_3 orientifold
- Correlation functions in conformal Toda field theory II
- Metastable vacua and D-branes at the conifold
- Geometric Transitions and Dynamical SUSY Breaking
- Lifting D-Instanton Zero Modes by Recombination and Background Fluxes
- Hierarchies from D-brane instantons in globally defined Calabi-Yau Orientifolds
- Neutrino Masses and Mixings from String Theory Instantons
- Non-perturbative F-terms across lines of BPS stability
- D-Instanton Generated Dirac Neutrino Masses
- Non-perturbative superpotentials across lines of marginal stability
- On mass hierarchies in orientifold vacua
- The Weinberg Operator and a Lower String Scale in Orientifold Compactifications
- Stringy Instantons and Yukawa Couplings in MSSM-like Orientifold Models
- New Grand Unified Models with Intersecting D6-branes, Neutrino Masses, and Flipped SU(5)
- (Non-)BPS bound states and D-brane instantons
- Statistics of SU(5) D-Brane Models on a Type II Orientifold
- Discriminating MSSM families in (free-field) Gepner Orientifolds
- Chiral Gepner Model Orientifolds
- Branes vs. GUTS: challenges for string inspired phenomenology
- MSSM GUT String Vacua, Split Supersymmetry and Fluxes
- D-brane instantons and matrix models
- Supersymmetric SU(5) GUT with Stabilized Moduli
- Non-Perturbative Effects on a Fractional D3-Brane
- Dynamical Supersymmetry Breaking in Intersecting Brane Models