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arXiv 0712.2215math.AG
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关于Petri曲线上的(n,d,n+1)型协调系统

On coherent systems of type (n,d,n+1) on Petri curves

U. N. Bhosle, L. Brambila-Paz, P. E. Newstead

摘要:

研究了在亏格为$g\ge2$的Petri曲线$X$上的$(n,d,n+1)$型协调系统.我们描述了这样的协调系统的参数$α$的大值的模空间的几何形状。我们确定了$α$的最高临界值,并表明相应的“翻转”具有正余维。我们还调查了非空的模空间较小的值$α$,证明在许多情况下,非空的条件是相同的大$α$。我们给出了$g\le5$的一些详细结果,并应用于高阶Brill-Noether理论和赋值映射核的稳定性,从而在某些情况下证明了Butler猜想.

英文摘要:

We study coherent systems of type $(n,d,n+1)$ on a Petri curve $X$ of genus $g\ge2$. We describe the geometry of the moduli space of such coherent systems for large values of the parameter $α$. We determine the top critical value of $α$ and show that the corresponding ``flip'' has positive codimension. We investigate also the non-emptiness of the moduli space for smaller values of $α$, proving in many cases that the condition for non-emptiness is the same as for large $α$. We give some detailed results for $g\le5$ and applications to higher rank Brill-Noether theory and the stability of kernels of evaluation maps, thus proving Butler's conjecture in some cases in which it was not previously known.

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