The cohomological DT/PT correspondence with insertions on Calabi–Yau fourfolds

Let XX be a smooth projective Calabi–Yau fourfold and let βH2(X,Z)\beta\in H_2(X,\mathbb Z). For a line bundle LL on XX, write L[n]L^{[n]} for its tautological bundle on the relevant moduli space, and let [In(X,β)]vir[I_n(X,\beta)]^{\mathrm{vir}} and [Pn(X,β)]vir[P_n(X,\beta)]^{\mathrm{vir}} denote the virtual classes of ideal sheaves and stable pairs. Cohomological DT/PT correspondence with insertions. There exist choices of orientations such that

n[In(X,β)]vire(L[n])qnn[In(X,0)]vire(L[n])qn=n[Pn(X,β)]vire(L[n])qn.\frac{\sum_n \int_{[I_n(X,\beta)]^{\mathrm{vir}}}e(L^{[n]})q^n}{\sum_n \int_{[I_n(X,0)]^{\mathrm{vir}}}e(L^{[n]})q^n}=\sum_n \int_{[P_n(X,\beta)]^{\mathrm{vir}}}e(L^{[n]})q^n.

This conjecture is motivated by the toric K-theoretic correspondence and its cohomological limit; the statement concerns smooth projective Calabi–Yau fourfolds beyond the toric setting.

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Primary source

Yalong Cao, Martijn Kool and Sergej Monavari, “K-theoretic DT/PT correspondence for toric Calabi-Yau 4-folds”, arXiv:1906.07856 (2022).

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