Abstract
The superheavy magnetic monopoles predicted to exist in grand unified theories (GUTs) are very interesting objects, both from the point of view of particle physics, as well as from astrophysics and cosmology. Astrophysical and cosmological considerations have proved to be invaluable in studying the properties of GUT monopoles. Because of the glut of monopoles predicted in the standard cosmology for the simplest GUTs (so many that the Universe should have reached a temperature of 3 K at the tender age of ≃ 10,000 yrs), the simplest GUTs and the standard cosmology are not compatible. This is a very important piece of information about physics at unification energies (E ≳ 1014 GeV) and about the earliest moments (t ≲ 10−34 s) of the Universe. In this talk I review the cosmological consequences of GUT monopoles within the context of the standard hot big bang model.
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