2002/06/26 by Michael Dine, Yosef Nir, Yael Shadmi · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.66.115001
published as Phys.Rev. D66 (2002) 115001 · 23 pages; no figures; revtex4
arxiv created 2002/06/26 · openalex publication_date 2002/12/20 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study grand unified theories (GUT) based on an SU(5)\ifmmode×\else\texttimes\fiSU(5) gauge group in which the GUT scale, MGUT, is the vacuum expectation value of an exact or approximate modulus, and in which fast proton decay is avoided through a combination of a large triplet mass and small triplet couplings. These features are achieved by discrete symmetries. In many of our models, MGUT is generated naturally by the balance of higher dimension terms that lift the GUT modulus potential, and soft supersymmetry breaking masses. The theories often lead to interesting patterns of quark and lepton masses. We also discuss some distinctions between grand unified theories and string unification.