Untwisted Moduli and Internal Fermions in Free Fermionic Strings

Details Untwisted Moduli and Internal Fermions in Free Fermionic Strings Untwisted Moduli and Internal Fermions in Free Fermionic Strings

1994-10-04

arxiv.org/abs/hep-th/9410018v1

Nucl.Phys. B438 (1995) 138-160

Physics

High Energy Physics

High Energy Physics - Theory

31 pages and 5 tables in phyzzx.tex and tables.tex, WIS-94/41/SEP-PH

Scientific paper

10.1016/0550-3213(94)00578-3

We investigate the dependence of the number and type of untwisted moduli on the boundary condition vectors of relistic free fermionic strings. The number of moduli is given by six minus the number of complex internal world--sheet fermions and the type of moduli is determined by the details of the world--sheet left--right asymmetry of the boundary conditions for the internal fermions. We give a geometrical description of our results in terms of the transformations of the compactified dimensions of $Z_2 \times Z_2$ orbifolds. We investigate all possible boundary conditions for the internal fermions and prove our results in general by showing that world--sheet supersymmetry eliminates those boundary conditions which violate our results.

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