The supersymmetry breaking parameters and the resulting supersymmetric particle spectrum are studied in orbifold compactifications of string theory under the assumption that unification of gauge coupling constants at about $10^{ 16}$ GeV is a consequence of large moduli dependent string loop threshold corrections. The effect on the spectrum of various assumptions as to the modular weights of the states, the values of the Green-Schwarz parameter, $\delta_{ GS}$, the origin of the $\mu$ parameter and the moduli dependence of Yukawa couplings is discussed. The effect of radiative corrections to the effective potential is also considered.
Categories: hep-ph