Reducing the rank of the gauge group in orbifold compactifications of the heterotic string
Abstract
Using the fact that the space group of an orbifold is nonabelian, we can reduce the rank of the fourdimensional gauge group obtained from orbifold compactification of the heterotic string. The embedding of the space group in the gauge degrees of freedom is performed by assigning shifts (Wilson lines) in the E_{8} × E_{8} lattice to the shifts in the sixdimensional lattice, and E_{8} × E_{8} Weyl rotations to the spatial discrete rotations. Reducing the rank of the gauge group is phenomenologically interesting for explaining the absence of extra lowenergy gauge interactions.
 Publication:

Physics Letters B
 Pub Date:
 July 1987
 DOI:
 10.1016/03702693(87)901171
 Bibcode:
 1987PhLB..192..332I