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On the Virasoro fusion kernel at c=25

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arxiv 2310.09334 v2 pith:D2TZZIXA submitted 2023-10-13 hep-th math-phmath.MP

On the Virasoro fusion kernel at c=25

classification hep-th math-phmath.MP
keywords fusionformulakernelkernelsmodularvirasoroagreescoefficients
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We find a formula for the Virasoro fusion kernel at $c=25$, in terms of the connection coefficients of the Painlev\'e VI differential equation. Our formula agrees numerically with previously known integral representations of the kernel. The derivation of our formula relies on a duality $c\to 26-c$ that is obeyed by the shift equations for the fusion and modular kernels. We conjecture that for $c<1$ the fusion and modular kernels are not smooth functions, but distributions.

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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. On the Virasoro Crossing Kernels at Rational Central Charge

    hep-th 2025-12 conditional novelty 8.0

    At rational central charge, the Virasoro crossing kernels decompose into two admissible square-root-branched kernels; the physical c≤1 kernels are derived for the first time.

  2. (1,k) CFT and RH problem with the c=-2 case

    math-ph 2026-07 conditional novelty 6.0

    For (1,k) Virasoro models, periodic vertex operators plus two degenerate fields solve a modified Riemann–Hilbert problem; in the k=2, c=-2 case the solution is explicit and satisfies new bilinear identities.