Table of Contents
ISRN High Energy Physics
Volume 2013 (2013), Article ID 595070, 15 pages
Research Article

Initial Systematic Investigations of the Landscape of Low-Layer NAHE Variation Extensions

EUCOS-CASPER, Department of Physics, Baylor University, Waco, TX 76978, USA

Received 3 June 2013; Accepted 8 July 2013

Academic Editors: C. A. D. S. Pires, A. Koshelev, and M. Masip

Copyright © 2013 Timothy Renner et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The discovery that the number of physically consistent string vacua is on the order of 10500 has prompted several statistical studies of string phenomenology. Focusing on the Weakly Coupled Free Fermionic String formalism, we present systematic extensions of a variation on the NAHE (Nanopoulos, Antoniadis, Hagelin, Ellis) set of basis vectors. This variation is more conducive to the production of “mirrored” models, in which the observable and hidden sector gauge groups (and possibly matter content) are identical. This study is parallel to the extensions of the NAHE set itself and presents statistics related to similar model properties. Statistical coupling between specific gauge groups and spacetime supersymmetry is also examined. Finally, a model with completely mirrored gauge groups is discussed. It is found that the region of the landscape explored generates no physically realistic models due to a lack of three net chiral generations.