Mathieu Moonshine Computed, the Double-Scaled Little String Bridge, and Dyons on K3 x T2 in Lean 4

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Publication Details

Journal
Zenodo (CERN European Organization for Nuclear Research)
Published
2026-09-18
DOI
https://doi.org/10.5281/zenodo.22837834
Primary Topic
Algebraic structures and combinatorial models
Type
preprint
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preprint

Mathieu Moonshine Computed, the Double-Scaled Little String Bridge, and Dyons on K3 x T2 in Lean 4

SocrateAI Scientific Agora Collaboration, Xavier Callens
Zenodo (CERN European Organization for Nuclear Research)
Algebraic structures and combinatorial models
preprint

Mathieu Moonshine Computed, the Double-Scaled Little String Bridge, and Dyons on K3 x T2 in Lean 4

SocrateAI Scientific Agora Collaboration, Xavier Callens
preprint en

Abstract

We report two Lean 4 libraries (toolchain v4.33.1, Mathlib) in which the mathematics around the $K3$ elliptic genus is computed from closed formulas rather than transcribed from tables. DualScaleMoonshine (Stream 4) computes Mathieu moonshine from both sides: the mock modular form $H^{(2)}=(-2E_2+48F_2)/\eta^3$ and its 21 twined series from their formulas, and the traces of all 26 conjugacy classes of $\Mtf$ from the character table over $\mathbb{Z}[b_7]$, $\mathbb{Z}[b_{15}]$, $\mathbb{Z}[b_{23}]$; the two meet at every class, and the first ten graded pieces of the moonshine module decompose, from computed data, exactly as in Cheng–Duncan–Harvey's printed table. The same library locates the "24" of the shadow in the polar/finite decomposition of the elliptic genus, and reproduces the arithmetic of Harvey–Murthy–Nazaroglu's double-scaled little string theories, including a two-sided proof of a divisibility they left unexplained. DualScaleDyons (Stream 5) builds the quarter-BPS dyon partition function $1/\Phi_{10}$ on $K3× T^2$ from the computed elliptic genus, and shows through the orders stated that its single-centred ("immortal") part at $m=1,2,3$ is given by Hurwitz class numbers, and that its $\Mtf$-twisted versions have virtual-character coefficients. The twining ("forger's") test, applied throughout, rejects an integer coincidence proposed earlier in this programme (the "27720 lock") at all 25 non-identity classes, while $24=\chi(K3)$ and the Göttsche numbers pass it. Four reading notes on the literature are recorded. Everything computed is Tier A (kernel-checked; 101 and 44 theorems, 0 failing; axioms propext, Classical.choice, Quot.sound at most); every physical reading is Tier L or Tier C. These are results about the mathematics of $\mathcal{N}=4$ string compactifications on $K3× T^2$, not about our universe: the one experimental prediction of this programme has separately been found excluded by existing data. Epistemic tiers. Claims are labelled Tier A (checked by the Lean 4 kernel; axioms propext, Classical.choice, Quot.sound only), Tier L (literature, cited) or Tier C (conjecture). Only Tier A statements are machine-checked; physical interpretation is not. Lean artifact: SocrateAI-Scientific-Agora-LeanMaster, tag v3.17.0 (Lean 4 v4.33.1, Mathlib). Release gates on this tag: all ten libraries build; 621 theorems pass #print axioms with standard axioms only; no sorry/admit. AI-assisted tooling (Anthropic Claude models) was used in preparing the formalization and the manuscript, under the direction of the author.

Zenodo (CERN European Organization for Nuclear Research)
Laboratoire de Mathématiques d'Orsay (FR)
Quality Education
Algebraic structures and combinatorial models
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