On a NAHE variation Original Research Article

We present a variation of the NAHE-basis for free fermionic heterotic string models. By rotating some of the boundary conditions of the NAHE periodic/anti-periodic fermions image, for image to 6, associated with the six compact dimensions of a bosonic lattice/orbifold model, we show an additional method for enhancing the standard NAHE gauge group of image back to image. This rotation transforms image into image. When image is enhanced to image in this manner, the ith MSSM matter generation in the image image rep, originating in the twisted basis vector image, recombines with both its associated untwisted MSSM Higgs in a image rep and an untwisted non-Abelian singlet image, to form a image rep of image. Beginning instead with the image model, the inverse transformation of the fermion boundary conditions corresponds to partial GUT breaking via boundary rotation.