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We show agreements, at one-loop level of field theory, between energies ofsemiclassical string states on AdS_5 x S^5/Z_M and anomalous dimensions ofoperators in N=0,1,2 orbifold field theories originating from N=4 SYM. On fieldtheory side, one-loop anomalous dimension matrices can be regarded asHamiltonians of spin chains with twisted boundary conditions. These aresolvable by Bethe ansatz. On string side, twisted sectors emerge and we obtainsome string configurations in twisted sectors. In SU(2) subsectors, we compareanomalous dimensions with string energies and see agreements. We also seeagreements between sigma models of both sides in SU(2) and SU(3) subsectors.Comment: LaTeX, 23 pages, 4 figures; v2 minor corrections, added references;  v3 typos corrected, published versio

Semiclassical Strings onAdS5 S5/ZMand Operators in Orbifold Field Theories

Semiclassical Strings onAdS₅ S⁵/Z_Mand Operators in Orbifold Field Theories