"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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Original Language: English
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Andreas Mütter, Michael Ratz, and Patrick K.S. Vaudrevange:
https://en.wikiquote.org/wiki/Proton_decay
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Proton decay
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