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arXiv math/0311239math.AG
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亏格0的协调系统

Coherent systems of genus 0

H. Lange, P. E. Newstead

摘要:

本文首先对射影直线上的协调系统$(E,V)$进行分类,这些相干系统对参数$α$的某个值是稳定的。特别地,我们证明了模空间,如果非空的,总是光滑的和不可约的预期的尺寸。我们得到了非空的必要条件,当$\dim V=1$或2时,我们精确地确定了这些条件。在其他情形下也得到了部分结果。

英文摘要:

In this paper we begin the classification of coherent systems $(E,V)$ on the projective line which are stable with respect to some value of a parameter $α$. In particular we show that the moduli spaces, if non-empty, are always smooth and irreducible of the expected dimension. We obtain necessary conditions for non-emptiness and, when $\dim V=1$ or 2, we determine these conditions precisely. We also obtain partial results in some other cases.

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