Gravitational GUT Breaking and the GUT-Planck Hierarchy
Abstract
It is shown that non-renormalizable gravitational interactions in the Higgs sector of supersymmetric grand unified theories (GUT's) can produce the breaking of the unifying gauge group at the GUT scale ~GeV. Such a breaking offers an attractive alternative to the traditional method where the superheavy GUT scale mass parameters are added ad hoc into the theory. The mechanism also offers a natural explanation for the closeness of the GUT breaking scale to the Planck scale. A study of the minimal SU(5) model endowed with this mechanism is presented and shown to be phenomenologically viable. A second model is examined where the Higgs doublets are kept naturally light as Goldstone modes. This latter model also achieves breaking of at but cannot easily satisfy the current experimental proton decay bound.
Keywords
Cite
@article{arxiv.hep-ph/9512268,
title = {Gravitational GUT Breaking and the GUT-Planck Hierarchy},
author = {S. Urano and D. Ring and R. Arnowitt},
journal= {arXiv preprint arXiv:hep-ph/9512268},
year = {2008}
}
Comments
11 pages, REVTeX, 1 figure included as an uuencoded Z-compressed PostScript file. Our Web page at http://physics.tamu.edu/~urano/research/gutplanck.html contains ready to print PostScript version (with figures) as well as color version of plots