Virtual ${\chi }_{-y}$-genera of Quot schemes on surfaces

Abstract

This paper studies the virtual ${\chi }_{-y}$-genera of Grothendieck's Quot schemes on surfaces, thus refining the calculations of the virtual Euler characteristics by Oprea-Pandharipande. We first prove a structural result expressing the equivariant virtual ${\chi }_{-y}$-genera of Quot schemes universally in terms of the Seiberg-Witten invariants. The formula is simpler for curve classes of Seiberg-Witten length $N$, which are defined in the paper. By way of application, we give complete answers in the following cases: (i) arbitrary surfaces for the zero curve class, (ii) relatively minimal elliptic surfaces for rational multiples of the fiber class, (iii) minimal surfaces of general type with $p_g>0$ for any curve classes. Furthermore, a blow up formula is obtained for curve classes of Seiberg-Witten length $N$. As a result of these calculations, we prove that the generating series of the virtual ${\chi }_{-y}$-genera are given by rational functions for all surfaces with $p_g>0$, addressing a conjecture of Oprea-Pandharipande. In addition, we study the reduced ${\chi }_{-y}$-genera for $K3$ surfaces and primitive curve classes with connections to the Kawai-Yoshioka formula.

arXiv comment48 pages. Reformulation of Theorem 1 for readability. Extra explanation for the mixed terms in section 2.2.3. Reference updates

References in corpus (13)

• A Strong Coupling Test of S-Duality
• The intrinsic normal cone
• Vafa-Witten invariants for projective surfaces I: stable case
• Riemann-Roch theorems and elliptic genus for virtually smooth Schemes
• On blowup formulae for the S-duality conjecture of Vafa and Witten
• Vafa-Witten invariants for projective surfaces II: semistable case
• A short proof of the Göttsche conjecture
• Equivariant K-theory and refined Vafa-Witten invariants
• Virtual refinements of the Vafa-Witten formula
• Reduced classes and curve counting on surfaces II: calculations
• Quot schemes of curves and surfaces: virtual classes, integrals, Euler characteristics
• Monopole contributions to refined Vafa-Witten invariants
• Degeneracy loci, virtual cycles and nested Hilbert schemes II

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