Non-Tachyonic Semi-Realistic Non-Supersymmetric Heterotic String Vacua

Johar M. Ashfaque, Panos Athanasopoulos, Alon E. Faraggi +1

The heterotic--string models in the free fermionic formulation gave rise to some of the most realistic string models to date, which possess N=1 spacetime supersymmetry. Lack of evi…