All loop BMN state energies from matrices

Abstract

We study a quantum corrected SO(6) invariant matrix quantum mechanics obtained from the s-wave modes of the scalars of N = 4 SYM on S^3. For commuting matrices, this model is believed to describe the 1/8 BPS states of the full SYM theory. In the large N limit the ground state corresponds to a distribution of eigenvalues on a S^5 which we identify with the sphere on the dual geometry AdS_5x S^5. We then consider non-BPS excitations by studying matrix perturbations where the off-diagonal modes are treated perturbatively. To a first approximation, these modes can be described by a free theory of "string bits" whose energies depend on the diagonal degrees of freedom. We then consider a state with two string bits and large angular momentum J on the sphere. In the large J limit we use a simple saddle point approximation to show that the energy of these states coincides precisely with the BMN spectrum to all orders in the 't Hooft coupling. We also find some new problems with the all loop Bethe Ansatz conjecture of the N=4 SYM planar spin chain model.

19 pages, 2 figures. v2: typos corrected

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• Spinning strings and AdS/CFT duality
• Spinning strings and integrable spin chains in the AdS/CFT correspondence
• Integrability in QCD and beyond
• Quantizing Open Spin Chains with Variable Length: an example from Giant Gravitons
• Semiclassical Bethe Ansatz and AdS/CFT
• The SU(2) sector in AdS/CFT
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