Z2× Z2 orbifold compactification -- the origin of realistic free fermionic models
Abstract
All the realistic free fermionic models utilize a set of basis vectors, the NAHE set, that correspond to Z2× Z2 orbifold compactification with nontrivial background fields. I argue that the realistic features of free fermionic models, like the number of generations and the fermion mass spectrum are due to the underlying Z2× Z2 orbifold compactification.
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