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arXiv 0808.1996math.AG
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框架丛的模空间的Torelli定理

Torelli theorem for the moduli space of framed bundles

Indranil Biswas, Tomas L. Gomez, Vicente Muñoz

摘要:

设X是亏格g>2的不可约光滑复射影曲线,x是一个不动点.一个框架丛是一个对(E,n),其中E是X上的向量丛,秩为r,度为d,n:E_x \to C^r是非零同态。对于依赖于参数τ>0的框架丛,存在一个(半)稳定性的概念,它给出了τ-半稳定框架丛M^τ的模空间.我们证明了M^τ的Torelli定理,当τ>0足够小时,这意味着单点曲线(X,x)的同构类以及整数r由簇M^τ的同构类唯一确定。

英文摘要:

Let X be an irreducible smooth complex projective curve of genus g>2, and let x be a fixed point. A framed bundle is a pair (E,ϕ), where E is a vector bundle over X, of rank r and degree d, and ϕ:E_x\to C^r is a non-zero homomorphism. There is a notion of (semi)stability for framed bundles depending on a parameter τ>0, which gives rise to the moduli space of τ-semistable framed bundles M^τ. We prove a Torelli theorem for M^τ, for τ>0 small enough, meaning, the isomorphism class of the one-pointed curve (X,x), and also the integer r, are uniquely determined by the isomorphism class of the variety M^τ.

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