Degeneracy loci, virtual cycles and nested Hilbert schemes II
Degeneracy loci, virtual cycles and nested Hilbert schemes II
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简并位点、虚拟循环和嵌套希尔伯特方案 II
DOI:
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发表时间:
2019
影响因子:
1.8
通讯作者:
Richard P. Thomas
中科院分区:
文献类型:
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作者:
A. Gholampour;Richard P. Thomas
We express nested Hilbert schemes of points and curves on a smooth projective surface as ‘virtual resolutions’ of degeneracy loci of maps of vector bundles on smooth ambient spaces. We show how to modify the resulting obstruction theories to produce the virtual cycles of Vafa–Witten theory and other sheaf-counting problems. The result is an effective way of calculating invariants (VW, SW, local PT and local DT) via Thom–Porteous-like Chern class formulae.