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Open Access item SU(5) D-brane realizations, Yukawa couplings and proton stability
Schellekens, A. N.
|Keywords:||Intersecting branes models, D-branes, Superstring Vacua|
|Citation:||Journal of High Energy Physics 12: 1-33 (2010)|
|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  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 10105H. 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.|
|Description:||33 páginas, 12 tablas.-- Open Access. This article is distributed under the terms of the Creative Commons
Attribution Noncommercial License which permits any noncommercial use, distribution,
and reproduction in any medium, provided the original author(s) and source are credited.-- et al.|
|Publisher version (URL):||http://dx.doi.org/10.1007/JHEP12(2010)011|
|Appears in Collections:||(CFMAC-IFF) Artículos|
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