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We obtain three and four dimensional conformal field theories with less thanmaximal supersymmetry by using their supergravity duals. These supergravitytheories are type II on $AdS_5 \times CP^2$, IIA on $AdS_4 \times CP^3$, IIB on$AdS_5 \times S^5/Z_k$ and D=11 supergravity on $AdS_4 \times S^7/Z_k$. Theyare obtained from the spherically compactified ten and eleven dimensionaltheories by either Hopf reduction or by winding the U(1) fiber over the base.Comment: 13 pages in phyzzx.tex, references adde

SUPERGRAVITY ON AdS5/4× HOPF FIBRATIONS AND CONFORMAL FIELD THEORIES

SUPERGRAVITY ON AdS_5/4× HOPF FIBRATIONS AND CONFORMAL FIELD THEORIES