### Abstract

In the framework of four dimensional heterotic superstring with free fermions we investigate the rank eight Grand Unified String Theories (GUST) which contain the SU(3)_{H}-gauge family symmetry. We explicitly construct GUSTs with gauge symmetry G = SU(5) × U(1) × (SU(3) × U(1))_{H} ⊂ SO(16) ⊂ E(8) in free complex fermion formulation. We solve the problem of the GUST symmetry breaking taking for the observable gauge symmetry the diagonal subgroup G^{sym} of rank 16 group G × G ⊂ SO(16) × SO(16) ⊂ E(8) × E(8). In this approach the observed electromagnetic charge Q^{em} can be viewed as a sum of two Q^{1}- and Q^{2}-charges of each G-group. In this case the model spectrum does not contain particles with exotic fractional charges.

Original language | English |
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Pages (from-to) | 319-328 |

Number of pages | 10 |

Journal | Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 328 |

Issue number | 3-4 |

DOIs | |

Publication status | Published - 2 Jun 1994 |

Externally published | Yes |

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### Cite this

*Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics*,

*328*(3-4), 319-328. https://doi.org/10.1016/0370-2693(94)91486-9

}

*Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics*, vol. 328, no. 3-4, pp. 319-328. https://doi.org/10.1016/0370-2693(94)91486-9

**Grand unified string theories with SU(3) gauge family symmetry.** / Maslikov, A. A.; Sergeev, S. M.; Volkov, G. G.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Grand unified string theories with SU(3) gauge family symmetry

AU - Maslikov, A. A.

AU - Sergeev, S. M.

AU - Volkov, G. G.

PY - 1994/6/2

Y1 - 1994/6/2

N2 - In the framework of four dimensional heterotic superstring with free fermions we investigate the rank eight Grand Unified String Theories (GUST) which contain the SU(3)H-gauge family symmetry. We explicitly construct GUSTs with gauge symmetry G = SU(5) × U(1) × (SU(3) × U(1))H ⊂ SO(16) ⊂ E(8) in free complex fermion formulation. We solve the problem of the GUST symmetry breaking taking for the observable gauge symmetry the diagonal subgroup Gsym of rank 16 group G × G ⊂ SO(16) × SO(16) ⊂ E(8) × E(8). In this approach the observed electromagnetic charge Qem can be viewed as a sum of two Q1- and Q2-charges of each G-group. In this case the model spectrum does not contain particles with exotic fractional charges.

AB - In the framework of four dimensional heterotic superstring with free fermions we investigate the rank eight Grand Unified String Theories (GUST) which contain the SU(3)H-gauge family symmetry. We explicitly construct GUSTs with gauge symmetry G = SU(5) × U(1) × (SU(3) × U(1))H ⊂ SO(16) ⊂ E(8) in free complex fermion formulation. We solve the problem of the GUST symmetry breaking taking for the observable gauge symmetry the diagonal subgroup Gsym of rank 16 group G × G ⊂ SO(16) × SO(16) ⊂ E(8) × E(8). In this approach the observed electromagnetic charge Qem can be viewed as a sum of two Q1- and Q2-charges of each G-group. In this case the model spectrum does not contain particles with exotic fractional charges.

KW - String Theory

UR - http://www.scopus.com/inward/record.url?scp=0000574514&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(94)91486-9

DO - 10.1016/0370-2693(94)91486-9

M3 - Article

VL - 328

SP - 319

EP - 328

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 3-4

ER -