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magnetic monopole problem
subjectfact 
magnetic monopole problemhas definition A problem, discovered by John Preskill in 1979, concerning the compatibility of grand unified theories with standard cosmology. Preskill showed that if standard cosmology were combined with grand unified theories, far too many magnetic monopoles would have been produced in the early universe.has source: Guth, A.H. 1997 The Inflationary Universe, Addison-Wesley, 2001-09-27 09:34:05.0
is an instance of problem2001-09-27 09:34:05.0