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arXiv 1111.6422math.AGmath.CO
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层的模空间中的齐次分支与Virasoro特征标

Homogeneous components in the moduli space of sheaves and Virasoro characters

A. Buryak, B. L. Feigin

摘要:

秩为$r$且第二陈类等于$n$的射影平面上框架无挠的的模空间$\mathcal M(r,n)$具有$(r+2)$维环面的自然作用量.在本文中,我们看看在这个环面不同的一维子环面的不动点集。我们证明了在齐次情形下,不可约分量的生成级数有一个漂亮的分解成一个无穷乘积。在奇数$r$的情况下,这些无穷乘积与某些Virasoro特征标一致。我们还提出了一个猜想,在一般拟齐次的情况下。

英文摘要:

The moduli space $\mathcal M(r,n)$ of framed torsion free sheaves on the projective plane with rank $r$ and second Chern class equal to $n$ has the natural action of the $(r+2)$-dimensional torus. In this paper, we look at the fixed point set of different one-dimensional subtori in this torus. We prove that in the homogeneous case the generating series of the numbers of the irreducible components has a beautiful decomposition into an infinite product. In the case of odd $r$ these infinite products coincide with certain Virasoro characters. We also propose a conjecture in a general quasihomogeneous case.

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