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Rational CFT With Three Characters: The Quasi-Character Approach

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arxiv 2002.01949 v2 pith:RHJ5BSU2 submitted 2020-02-05 hep-th cond-mat.str-elmath-phmath.MPmath.NT

classification hep-thcond-mat.str-elmath-phmath.MPmath.NT
keywords charactersadmissiblecasearxivfamiliesgenerateindexmodular
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Quasi-characters are vector-valued modular functions having an integral, but not necessarily positive, q-expansion. Using modular differential equations, a complete classification has been provided in arXiv:1810.09472 for the case of two characters. These in turn generate all possible admissible characters, of arbitrary Wronskian index, in order two. Here we initiate a study of the three-character case. We conjecture several infinite families of quasi-characters and show in examples that their linear combinations an generate admissible characters with arbitrarily large Wronskian index. The structure is completely different from the order two case, and the novel coset construction of arXiv:1602.01022 plays a key role in discovering the appropriate families. Using even unimodular lattices, we construct some explicit three-character CFT corresponding to the new admissible characters.

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Cited by 2 Pith papers

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

  1. Unlocking the Wronskian Tower: A Simplification of the Holomorphic Modular Bootstrap

    hep-th 2026-07 conditional novelty 6.0 of 10

    A differential operator Θ = η^{-4}D relates MLDE solutions across Wronskian sectors, reducing higher-ℓ quasi-character classification in ranks 2 and 3 to ℓ=0 data and proving the ℓ=2 sign conjecture.

  2. R\'enyi entropy of single-character CFTs on the torus

    hep-th 2024-11 conditional novelty 6.0 of 10

    A Wronskian-based method gives explicit torus conformal blocks for the Z2 orbifold of E8,1, yielding a two-periodic twist two-point function and the second Rényi entropy with universal logarithmic divergence plus UV-f...

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