1998/09/20 by Pierre Ramond, P. Ramond, Ramond, P. · 6 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9809459
Retro-Preprint (1979 unpublished Caltech preprint). Uses tex, with jnl macro, 19 pages. Invited talk at the Sanibel Symposia, Feb 1979
arxiv created 1998/09/20 · openalex publication_date 1998/09/20 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We review the known ways of incorporating and breaking symmetries in a renormalizable way. We summarize the various grand unified theories based on SU5, SO10, and E6 as family enlargement groups. An SU5 model with an SU2 gauged family group is presented as an illustration. In it, the e-family (i.e., e,u and d) is classically massless and acquires calculable mass corrections. The family group is broken by the same agent that does the superstrong breaking. Finally, we sketch a way of unifying the family group with SU5 into SU8.