Extracting predictions from Supergravity/Superstring for the effective theory below the Planck scale

The connection between Superstring theory and the low--energy world is analyzed. In particular, the soft Supersymmetry--breaking terms arising in Supergravity theories coming from Superstrings are computed. Several solutions proposed to solve the $μ$ problem, and the $B$ soft term associated, are discussed. The issue of gauge coupling constants unification in the context of Superstrings is also discussed.

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