TBA equations for the mass gap in the O(2r) non-linear σ-models

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We propose TBA integral equations for 1-particle states in the O(n) non-linear σ-model for even n. The equations are conjectured on the basis of the analytic properties of the large volume asymptotics of the problem, which is explicitly constructed starting from Lüscher's asymptotic formula. For small volumes the mass gap values computed numerically from the TBA equations agree very well with results of three-loop perturbation theory calculations, providing support for the validity of the proposed TBA system.

Original languageEnglish
Pages (from-to)531-553
Number of pages23
JournalNuclear Physics B
Issue number3
Publication statusPublished - Oct 10 2005

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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