Journal of High Energy Physics

, 2010:11

SU(5) D-brane realizations, Yukawa couplings and proton stability


  • P. Anastasopoulos
    • Technische Univ. Wien Inst. für Theoretische Physik
  • G. K. Leontaris
    • Theoretical Physics DivisionIoannina University
    • I.N.F.N. — Sezione di Roma “Tor Vergata”
  • A. N. Schellekens
    • NIKHEF
    • IMAPPRadboud Universiteit Nijmegen
    • Instituto de Física FundamentalCSIC
Open AccessArticle

DOI: 10.1007/JHEP12(2010)011

Cite this article as:
Anastasopoulos, P., Leontaris, G.K., Richter, R. et al. J. High Energ. Phys. (2010) 2010: 11. doi:10.1007/JHEP12(2010)011


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 [1] 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.


Intersecting branes modelsD-branesSuperstring Vacua
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