The full low-lying spectrum of the SU(N) flux tube in 4D matches an effective string model with Goldstone phonons, one massive axion, and T-bar-T dressing.
Luscher,Two particle states on a torus and their relation to the scattering matrix, Nucl
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Towards an Effective String Theory for the flux tube
The full low-lying spectrum of the SU(N) flux tube in 4D matches an effective string model with Goldstone phonons, one massive axion, and T-bar-T dressing.