A rank 2 Dijkgraaf-Moore-Verlinde-Verlinde formula

Abstract

We conjecture a formula for the virtual elliptic genera of moduli spaces of rank 2 sheaves on minimal surfaces $S$ of general type. We express our conjecture in terms of the Igusa cusp form ${\chi }_{10}$ and Borcherds type lifts of three quasi-Jacobi forms which are all related to the Weierstrass elliptic function. We also conjecture that the generating function of virtual cobordism classes of these moduli spaces depends only on $\chi ({\mathcal{O}}_S)$ and $K_S^2$ via two universal functions, one of which is determined by the cobordism classes of Hilbert schemes of points on $K3$. We present generalizations of these conjectures, e.g. to arbitrary surfaces with $p_g>0$ and $b_1=0$. We use a result of J. Shen to express the virtual cobordism class in terms of descendent Donaldson invariants. In a prequel we used T. Mochizuki's formula, universality, and toric calculations to compute such Donaldson invariants in the setting of virtual ${\chi }_y$-genera. Similar techniques allow us to verify our new conjectures in many cases.

24 pages. In order to keep the paper self-contained, we recall the necessary material from the prequel arXiv:1703.07196, which results in some overlap. Published version. Typo fixed

References in corpus (1)

• Algebraic cobordism

Cited by in corpus (9)

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