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Grand unified models of elementary particle interactions contain stable superheavy magnetic monopoles. The density of such monopoles in the early universe is estimated to be unacceptably large. Cosmological monopole production may be suppressed if the phase transition at the grand unification mass scale is strongly first order.
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John Preskill (Mon,) studied this question.
synapsesocial.com/papers/69e9ca63766d3f32f8ccf6f0 — DOI: https://doi.org/10.1103/physrevlett.43.1365
John Preskill
Paris Centre for Quantum Technologies
Physical Review Letters
Harvard University
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