On the origin of three generation free fermionic superstring models

Details On the origin of three generation free fermionic superstring models On the origin of three generation free fermionic superstring models

1995-11-14

arxiv.org/abs/hep-th/9511093v1

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, phyzzx.tex, tables.tex

Scientific paper

The three generation superstring models in the free fermionic models have had remarkable success in describing the real--world. The most explored models use the NAHE set to obtain three generations and to separate the hidden and observable sectors. It is of course well known that the full NAHE set is not required in order to construct three generation free fermionic models. I argue that all the semi--realistic free fermionic models that have been constructed to date correspond to $Z_2\times Z_2$ orbifolds. Thus, the successes of the semi--realistic free fermionic models, if taken seriously, suggest that the true string vacuum is a $Z_2\times Z_2$ orbifold with nontrivial background fields and quantized Wilson lines.

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