Lifting asymptotic degeneracies with the Mirror TBA

Details Lifting asymptotic degeneracies with the Mirror TBA Lifting asymptotic degeneracies with the Mirror TBA

2011-06-20

arxiv.org/abs/1106.3909v3

JHEP 1109:050,2011

Physics

High Energy Physics

High Energy Physics - Theory

v3, 20 pages, 1 figure, 2 tables, as published

Scientific paper

We describe a qualitative feature of the AdS_5 x S^5 string spectrum which is not captured by the asymptotic Bethe ansatz. This is reflected by an enhanced discrete symmetry in the asymptotic limit, whereby extra energy degeneracy enters the spectrum. We discuss how finite size corrections should lift this degeneracy, through both perturbative (Luscher) and non-perturbative approaches (the Mirror TBA), and illustrate this explicitly on two such asymptotically degenerate states.

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