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arXiv math/0008198math.AG
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椭圆曲线上某些ruled surfaces上框架层的模空间

Moduli spaces of framed sheaves on certain ruled surfaces over elliptic curves

Thomas A. Nevins

摘要:

固定一个直纹曲面S作为复椭圆曲线上的线丛L的射影完备,我们研究了参数化由S上的层E和E到S上固定参考层的映射组成的某些对的模问题。我们证明了这个问题的全模栈是由一个计划在某些情况下表示。此外,模栈允许一个行动的组${\mathbf C}^*$,我们确定其不动点集,这导致在某些特殊情况下,明确的公式的有理同调的模空间。

英文摘要:

Fix a ruled surface S obtained as the projective completion of a line bundle L on a complex elliptic curve; we study the moduli problem of parametrizing certain pairs consisting of a sheaf E on S and a map of E to a fixed reference sheaf on S. We prove that the full moduli stack for this problem is representable by a scheme in some cases. Moreover, the moduli stack admits an action by the group ${\mathbf C}^*$, and we determine its fixed-point set, which leads in some special cases to explicit formulas for the rational homology of the moduli space.

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