2003/07/28 by Ron Donagi, Burt A. Ovrut, Burt A.Ovrut +2
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-th
paper · pdf · doi:10.1088/1126-6708/2004/01/022
published as JHEP0401:022,2004 · 68 pages, no figures
arxiv created 2003/07/28 · openalex publication_date 2004/01/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
Structure group SU(4) gauge vacua of both weakly and strongly coupled heterotic superstring theory compactified on torus-fibered Calabi-Yau threefolds Z with Z2 x Z2 fundamental group are presented. This is accomplished by constructing invariant, stable, holomorphic rank four vector bundles on the simply connected cover of Z. Such bundles can descend either to Hermite-Yang-Mills instantons on Z or to twisted gauge fields satisfying the Hermite-Yang-Mills equation corrected by a non-trivial flat B-field. It is shown that large families of such instantons satisfy the constraints imposed by particle physics phenomenology. The discrete parameter spaces of those families are presented, as well as a lower bound on the dimension of the continuous moduli of any such vacuum. In conjunction with Z2 x Z2 Wilson lines, these SU(4) gauge vacua can lead to standard-like models at low energy with an additional U(1)B-L symmetry. This U(1)B-L symmetry is very helpful in naturally suppressing nucleon decay.