arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.07641math.AG
收藏

曲面的上同调Hall代数与分解上同调

The cohomological Hall algebra of a surface and factorization cohomology

Mikhail Kapranov, Eric Vasserot

摘要:

对于复数上的光滑拟投射曲面S,考虑S上紧支撑相干层堆叠的Borel-Moore同调,并通过Hall乘法的一种形式使该空间成为一个结合代数.该乘法涉及支配导出的模数栈的数据(虚拟回调),即,自然存在于非导出栈上的完全阻塞理论。通过限制到具有给定维数支撑的层,我们得到了几类Hecke算子。特别是,我们研究了0维层的Hecke代数R(S)。对于平坦情形S=A^2,我们证明了R(S)是一个包络代数,并将它作为向量空间与显分次向量空间的对称代数等同起来.对于一般的S,我们使用因子分解上同调的技巧找到R(S)的分次维数。

英文摘要:

For a smooth quasi-projective surface S over complex numbers we consider the Borel-Moore homology of the stack of coherent sheaves on S with compact support and make this space into an associative algebra by a version of the Hall multiplication. This multiplication involves data (virtual pullbacks) governing the derived moduli stack, i.e., the perfect obstruction theory naturally existing on the non-derived stack. By restricting to sheaves with support of given dimension, we obtain several types of Hecke operators. In particular, we study R(S), the Hecke algebra of 0-dimensional sheaves. For the flat case S=A^2, we show that R(S) is an enveloping algebra and identify it, as a vector space, with the symmetric algebra of an explicit graded vector space. For a general S we find the graded dimension of R(S), using the techniques of factorization cohomology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑