Realistic string model and technicolor

• Published in: Physics letters. B Vol. 191; no. 4; pp. 369 - 374
• Main Author: Li, Da-Xi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 18.06.1987; Elsevier Science
• Subjects: Classical and quantum physics: mechanics and fields; Exact sciences and technology; Physics; Theory of quantized fields; Quantum field theory
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(87)90624-1

A realistic string model is constructed by compactifying the E 8 × E′ 8 heterotic strings via a manifold T 22/G. The theory is modular invariant and tachyon free. In the low-energy limit there are three families of light fermions with exactly the same quantum numbers as in the standard SU(3) × SU(2) × U(1) model. They couple to gravity and gauge fields with the gauge symmetry SU(3) F × SU(3) C × SU(2) L × SU(2) R × U(1) 2 × SU(4)′ × SU(3)′ × SU(2)′ × U(1)′ 2. The SU(4)′ group can play the role of the technicolor group to break the SU(3) F × SU(2) R × SU(2) L × U(1) 2 symmetry and generate fermion masses.