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On KdV characters in large c CFTs

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arxiv 1901.10354 v2 pith:XBDMIPRL submitted 2019-01-29 hep-th cond-mat.stat-mech

On KdV characters in large c CFTs

classification hep-th cond-mat.stat-mech
keywords characterschargesconformalfieldintegrablelargelimittheory
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Two-dimensional conformal field theories with just Virasoro symmetry are endowed with integrable structure. We review how to construct the integrable charges in a two-dimensional conformal field theory and how to relate them to the charges of quantum Sinh-Gordon theory when c>25. We then explicitly calculate the single charge characters in the large c limit for all charges and thereby reveal how their degeneracies grow within one module. This, in particular, allows us to approximate the characters in the limit of small chemical potential, which source the respective charges. The latter give us insights into possible transformation properties of the characters. We also comment on the full generalized Gibbs ensemble and approximations to pure states.

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  1. Modular Properties of Symplectic Fermion Generalised Gibbs Ensemble

    hep-th 2026-03 unverdicted novelty 7.0

    Exact modular S-transforms are derived for GGEs in the symplectic fermion theory, agreeing with conjectures for the W3 zero mode and mirroring free-fermion results for the KdV subset.