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Free fermions, KdV charges, generalised Gibbs ensembles, modular transforms and line defects

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arxiv 2311.04564 v1 pith:WHA7FJ6Z submitted 2023-11-08 hep-th

Free fermions, KdV charges, generalised Gibbs ensembles, modular transforms and line defects

classification hep-th
keywords defectlinemodularchargesfreegeneralisedgibbsapproach
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this paper we return to the question of the modular properties of a generalised Gibbs ensemble of a single free fermion. We extend our previous proposals to a GGE containing an arbitrary number of conserved charges and provide a physical interpretation of the result in terms of a line defect. The defect description perfectly explains the product formula for the modular transformation we found previously. We also give a proposal for a Hamiltonian approach to the line defect.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Universal Modular Properties of Generalized Gibbs Ensembles and Chiral Deformations

    hep-th 2026-03 accept novelty 7.0

    Modular S-transforms of chirally deformed CFT partition functions are determined iteratively by second-order OPE poles of the deforming currents, with explicit multiplicities.

  2. 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.