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SU(N) flux tubes as Nambu-Goto strings

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We calculate the excitation spectrum of closed k=1 and k=2 flux tubes in 3 dimensional SU(N) gauge theories. We do so using lattice techniques. We obtain unambiguous evidence that the closed fundamental flux tube can be well approximated by the Nambu-Goto bosonic string. Our results demonstrate that the low-lying spectrum of the k=2 string falls into sectors that belong to nearly pure antisymmetric and symmetric representations. We also observe that the lightest states in each k=2 irreducible representation are consistent with what one would expect from an effective string theory that belongs to the same bosonic universality class as Nambu-Goto. In addition we observe unbound fundamental w=2 states.

This talk is part of the Quantum Fields and Strings Seminars series.

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