In particle physics, the crypton is a hypothetical superheavy particle, thought to exist in a hidden sector of string theory.
It has been proposed as a candidate particle to explain the dark matter content of the universe.
Cryptons arising in the hidden sector of a superstring-derived flipped SU(5) GUT model have been shown to be metastable with a lifetime exceeding the age of the universe.
Their slow decays may provide a source for the ultra-high-energy cosmic rays (UHECR).
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