T-branes and Yukawa Couplings
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.
Keywords
Cite
@article{arxiv.1101.2455,
title = {T-branes and Yukawa Couplings},
author = {Chan-Chi Chiou and Alon E. Faraggi and Radu Tatar and William Walters},
journal= {arXiv preprint arXiv:1101.2455},
year = {2011}
}
Comments
21 pages. Minor corrections