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

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Let Pq(X)=∑i≥0dim⁡Hi(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.

∑n≥0Pq(M(2,n)T1,1(0,0))tn=∏4∤i1(1−ti)(1−qti)∏i≥11(1−qt4i)(1−q2t4i),\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

∑n≥0Pq(M(2,n)T1,1(0,1))tn=∏n≥11−t4n−2(1−t2n−1)2(1−qt4n−2)2(1−q2t4n−2)(1−qt4n)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.

References

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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