T-branes and Yukawa Couplings
arXiv:1101.2455 · doi:10.1007/JHEP05(2011)023
Abstract
We consider various configurations of T-branes which are non-abelian bound states of branes and were recently introduced by Cecotti, Cordova, Heckman and Vafa. They are a refinement of the concept of monodromic branes featured in phenomenological F-theory models. We are particularly interested in the T-branes corresponding to Z3 and Z4 monodromies, which are used to break E7 or E8 gauge groups to SU(5) GUT. Our results imply that the up-type and down-type Yukawa couplings for the breaking of E7 are zero, whereas up-type and down-type Yukawa couplings, together with right handed neutrino Yukawas are non-zero for the case of the breaking of E8. The dimension four proton decay mediating term is avoided in models with either E7 or E8 breaking.
21 pages. Minor corrections
References in corpus (7)
- GUTs and Exceptional Branes in F-theory - II: Experimental Predictions
- Lectures on F-theory compactifications and model building
- New Aspects of Heterotic--F Theory Duality
- Monodromies, Fluxes, and Compact Three-Generation F-theory GUTs
- Right-handed Neutrinos in F-theory Compactifications
- A Novel String Derived Z' With Stable Proton, Light-Neutrinos and R-parity violation
- GUT Relations from String Theory Compactifications