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We calculate the induced Einstein action from supersymmetric models ingeneral space-time. Supersymmetric models consist of two kinds ofsupermultiplets, called scalar supermultiplets and vector supermultiplets,respectively. We show that the vector multiplets generate a negative Newtonconstant, while the scalar multiplets a positive one. Then we find that thepositivity of Newton constant depends on the ratio of the number of scalarmultiplets to one of vector multiplets. If we apply this result to two hopefulsupersymmetric unified models: one is minimal SUSY standard model and anotheris minimal SUSY SU(5) GUT, we are led to the conclusion that we need more thanor equal to three generations of quark and lepton multiplets to have a positiveNewton constant, i.e., an attractive gravity.Comment: 17 pages, no figur

Three generations or more for an attractive gravity?