Grand Unification without Proton Decay
classification
✦ hep-ph
hep-th
keywords
decayprotonclassgrandgutsoperatorsabsentbecause
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It is commonly believed that grand unified theories (GUTs) predict proton decay. This is because the exchange of extra GUT gauge bosons gives rise to dimension 6 proton decay operators. We show that there exists a class of GUTs in which these operators are absent. Many string and supergravity models in the literature belong to this class.
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