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Integrable Field Theories with an Interacting Massless Sector

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arxiv 2002.12060 v1 pith:JJJH3DNH submitted 2020-02-27 hep-th

Integrable Field Theories with an Interacting Massless Sector

classification hep-th
keywords massivemasslesssectorfieldintegrableinteractingspectrumtheories
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present the first known integrable relativistic field theories with interacting massive and massless sectors. And we demonstrate that knowledge of the massless sector is essential for understanding of the spectrum of the massive sector. Terms in this spectrum polynomial in the spatial volume (the accuracy for which the Bethe ansatz would suffice in a massive theory) require not just L\"uscher-like corrections (usually exponentially small) but the full TBA integral equations. We are motivated by the implications of these ideas for AdS/CFT, but present here only field-theory results.

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