Semiclassical strings on AdS5 x S5/ZM and operators in orbifold field theories -: art. no. 008

We show agreements, at one-loop level of field theory, between energies of semiclassical string states on AdS(5) X S-5/Z(M) and anomalous dimensions of operators in N = 0, 1, 2 orbifold field theories originating from N = 4 SYM. On field theory side, one-loop anomalous dimension matrices can be regarded as hamiltonians of spin chains with twisted boundary conditions. These are solvable by Bethe ansatz. On string side, twisted sectors emerge and we obtain some string configurations in twisted sectors. In SU(2) subsectors, we compare anomalous dimensions with string energies and see agreements. We also see agreements between sigma models of both sides in SU(2) and SU(3) subsectors.