The rank-two Betti-number generating-function conjecture for two torus actions

Let Pq(X)=i0dimHi(X)qi/2P_q(X)=\sum_{i\geq0}\dim H_i(X)q^{i/2} be the Poincare polynomial, and consider the rank-two moduli spaces M(2,n){\mathcal M}(2,n) with the two fixed components corresponding to T1,1(0,0)T^{(0,0)}_{1,1} and T1,1(0,1)T^{(0,1)}_{1,1}. Rank-two Betti-number conjecture.

n0Pq(M(2,n)T1,1(0,0))tn=4i1(1ti)(1qti)i11(1qt4i)(1q2t4i),\sum_{n\geq0}P_q\left({\mathcal M}(2,n)^{T^{(0,0)}_{1,1}}\right)t^n=\prod_{4\nmid i}\frac{1}{(1-t^i)(1-qt^i)}\prod_{i\geq1}\frac{1}{(1-qt^{4i})(1-q^2t^{4i})},

and

n0Pq(M(2,n)T1,1(0,1))tn=n11t4n2(1t2n1)2(1qt4n2)2(1q2t4n2)(1qt4n)2.\sum_{n\geq0}P_q\left({\mathcal M}(2,n)^{T^{(0,1)}_{1,1}}\right)t^n=\prod_{n\geq1}\frac{1-t^{4n-2}}{(1-t^{2n-1})^2(1-qt^{4n-2})^2(1-q^2t^{4n-2})(1-qt^{4n})^2}.

This is proposed as the rank-two analogue of the earlier Betti-number formula; the supplied text does not state whether it has been proved or disproved.

Sources & referencesView supporting material

Primary source

A. Buryak and B. L. Feigin, “Homogeneous components in the moduli space of sheaves and Virasoro characters”, arXiv:1111.6422 (2014).

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