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arXiv · hep-ph/9512268

Gravitational GUT Breaking and the GUT-Planck Hierarchy

S. Urano·D. Ring·R. Arnowitt
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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 $G$ at the GUT scale $M_{\rm GUT} \sim 10^{16}$~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 $G$ at $M_{\rm GUT}$ but cannot easily satisfy the current experimental proton decay bound.

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S. Urano, D. Ring, R. Arnowitt. 1995-12-11. Gravitational GUT Breaking and the GUT-Planck Hierarchy. https://doi.org/10.1103/physrevlett.76.3663

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