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Gravitational Breaking of the Grand Unified Theory Group and the Grand Unified Theory–Planck Hierarchy
It is shown that nonrenormalizable gravitational interactions in the Higgs sector of supersymmetric grand unified theories (GUTs) can produce the breaking of the unifying gauge group $G$ at the GUT scale ${M}_{\mathrm{GUT}}\ensuremath{\sim}{10}^{16}\mathrm{GeV}$. Such a breaking offers an attractive alternative to the traditional method where the superheavy GUT scale mass parameters …