MSUGRA:The Minimal Supergravity Framework
In this SUSY model it is assumed that the Gauge couplings unify at the GUT scale,
(M_GUT~10^16GeV). In other words alpha1=alpha2 at this scale. Gravitational interactions
in a hidden sector at this scale produce the universal soft SUSY breaking terms. Exact
coupling unification yeilds too large of a value for the strong coupling constant at the weak
scale. Therefore in this Minimal SUGRA model ISASUGRA takes the experimental value
for the strong coupling constant.