Orbifold Phenomenology

  • Kang-Sin Choi
  • Jihn E. Kim
Part of the Lecture Notes in Physics book series (LNP, volume 696)


In this chapter, we review several attempts toward obtaining a supersymmetric standard model from the E8 ×E′8 heterotic string and some phenomenological implications. In Chaps. 6–9, we discussed in length the theoretical framework for orbifolded superstrings. We restricted our discussion to the E8 ×E′8 heterotic string, chiefly because breaking the chain of E8 down to the SU(5) or SU(3)3 goes through the intermediate 27 of E6. This is an important observation since the fifteen chiral fields (2.8) of the standard model(SM) are contained in the fundamental 27 of E6 or in the spinor 16 of SO(10). By restricting ourselves to only this chain, we can automatically achieve the correct charge assignments, coming from 16 of SO(10). On the other hand, if the intermediate step cannot contain 27 of E6, it is most probable that exotically charged particles(exotics) would appear.1 But this argument utilizes matter only from the untwisted sector. For twisted sector matter, SO(32) breaking can be useful as commented in Sect. 10.4.


Gauge Group Yukawa Coupling Minimal Supersymmetric Standard Model Gauge Coupling Supersymmetry Breaking 
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Copyright information

© Springer 2006

Authors and Affiliations

  • Kang-Sin Choi
    • 1
  • Jihn E. Kim
    • 1
  1. 1.School of PhysicsSeoul National UniversitySeoulKorea

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