Deformations of N=4 SYM and integrable spin chain models

Abstract

Beginning with the planar limit of N=4 SYM theory, we study planar diagrams for field theory deformations of N=4 which are marginal at the free field theory level. We show that the requirement of integrability of the full one loop dilatation operator in the scalar sector, places very strong constraints on the field theory, so that the only soluble models correspond essentially to orbifolds of N=4 SYM. For these, the associated spin chain model gets twisted boundary conditions that depend on the length of the chain, but which are still integrable. We also show that theories with integrable subsectors appear quite generically, and it is possible to engineer integrable subsectors to have some specific symmetry, however these do not generally lead to full integrability. We also try to construct a theory whose spin chain has quantum group symmetry SO_q(6) as a deformation of the SO(6) R-symmetry structure of N=4 SYM. We show that it is not possible to obtain a spin chain with that symmetry from deformations of the scalar potential of N=4 SYM. We also show that the natural context for these questions can be better phrased in terms of multi-matrix quantum mechanics rather than in four dimensional field theories.

43 pages, Latex, 3 figures. v2: updated references, minor changes. v3: added one reference, minor changes

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• Non-conformality of gamma_i-deformed N=4 SYM theory
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• Melvin Twists of global AdS_5 \times S_5 and their Non-Commutative Field Theory Dual
• Rotating Strings with Two Unequal Spins in Lunin-Maldacena Background
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• Circular and Folded Multi-Spin Strings in Spin Chain Sigma Models
• Wrapping in maximally supersymmetric and marginally deformed N=4 Yang-Mills
• On the wrapping correction to single magnon energy in twisted N=4 SYM
• Spectral properties of supersymmetric Polychronakos spin chain associated with A_{N-1} root system
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