The generating-series conjecture for perverse numbers of parabolic Hitchin systems

Let μ\bm{\mu} be the multipartition encoding the parabolic data of MB(n)M_B(n), let kk be as defined in the paper, and let Hmu\mathbb{H}_{\bm{mu}} be the function defined in Section 1.1 of the cited work. The generating-series conjecture. For the A0~(n)\widetilde{A_0}(n) case, one has

m=1(1+smqmt2m1)2(1smqm1t2m2)(1smqm+1t2m)=n=0(st2q)nHμ(q,qt).\prod_{m=1}^\infty\frac{(1+s^mq^{m}t^{2m-1})^2}{(1-s^mq^{m-1}t^{2m-2})(1-s^mq^{m+1}t^{2m})}=\sum_{n=0}^\infty (st^2q)^n\mathbb{H}_{\bm{\mu}}(-\sqrt{q},\frac{\sqrt{q}}{t}).

For the other four cases, one has

m=11(1smqm1t2m2)(1smqmt2m)k(1smqm+1t2m)=n=0(st2q)nHμ(q,qt).\prod_{m=1}^\infty\frac{1}{(1-s^mq^{m-1}t^{2m-2})(1-s^mq^mt^{2m})^k(1-s^mq^{m+1}t^{2m})}=\sum_{n=0}^\infty (st^2q)^n\mathbb{H}_{\bm{\mu}}(-\sqrt{q},\frac{\sqrt{q}}{t}).

These identities give the proposed equality between the computed perverse-number generating series and the mixed-Hodge-number generating series predicted for the corresponding character varieties.

Sources & referencesView supporting material

Primary source

Zili Zhang, “Multiplicativity of Perverse Filtration for Hilbert Schemes of Fibered Surfaces”, arXiv:1512.04643 (2017).

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