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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

classification hep-th
keywords defectlinemodularchargesfreegeneralisedgibbsapproach
verification ladder T0 review T1 audit T2 compute T3 formal
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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 3 Pith papers

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

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

    hep-th 2026-03 accept novelty 7.0 of 10

    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. On W-algebras and ODE/IM correspondence

    hep-th 2025-08 conditional novelty 6.0 of 10

    The eigenvalues of quantum KdV-type charges in Virasoro, W3, and W4 algebras are computed from Bethe roots via WKB periods of Catalan curves, verified against direct CFT diagonalization.

  3. Modular Properties of $\mathcal{W}_3$ Generalised Gibbs Ensembles

    hep-th 2025-08 unverdicted novelty 6.0 of 10

    A proposed asymptotic expansion for the modular S-transform of W_3 generalized Gibbs ensembles with a W_0 charge, supported by Zhu's recursion checks and exact results at c=-2.

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