Mixed-Hodge-polynomial conjecture for modular data

Let Mg,nSU(2)/Z2\mathcal{M}_{g,n}^{SU(2)/\mathbb{Z}_2} be the relevant moduli space, and let

Pg,n(q)=iaiqdiP_{g,n}(q)=\sum_i a_iq^{d_i}

be the renormalization of the pure part of its mixed Hodge polynomial. Let Vg,nV_{g,n} be the associated vertex operator algebra, let Vg,nmod\mathbb{V}^{\mathrm{mod}}_{g,n} be its modular representation, and let [diai][d_i^{a_i}] denote Jordan blocks of size did_i with multiplicity aia_i.

Mixed-Hodge-polynomial conjecture. The total number of fixed manifolds of Mg,n\mathcal{M}_{g,n}, equivalently the number of simple modules of Vg,nV_{g,n}, is

Pg,n(1)=iai,P_{g,n}(1)=\sum_i a_i,

the modular representation has dimension

dimVg,nmod=iaidi,\dim\mathbb{V}^{\mathrm{mod}}_{g,n}=\sum_i a_id_i,

and the Jordan type of the modular matrix is [diai][d_i^{a_i}].

This conjecture proposes that the renormalized pure mixed Hodge polynomial simultaneously encodes the number of simple modules, the modular-representation dimension, and its Jordan type. The source does not state a resolution, so it remains open.

Sources & referencesView supporting material

Primary source

Yiwen Pan and Wenbin Yan, “Mirror symmetry for 4d A_1 class-S theories: modularity, defects and Coulomb branch”, arXiv:2412.03155 (2024).

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