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arXiv 1102.2312math.AGhep-thmath.RT
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复环面上的等变Gerbes

Equivariant Gerbes on Complex Tori

Oren Ben-Bassat

摘要:

本文从复环面上的全纯格点出发,探索了表示论的一个新方向。本文用(紧)复环面上的全纯线丛的θ群的类似物代替线丛,发展了gerbes。格贝对称的θ群具有皮卡广群的结构。我们计算它明确作为一个中心的扩展组的对称性的gerbe的皮卡广群的基础复杂的环面。我们讨论阻碍等变,并给出一个例子的一组对称的gerbe的gerbe不能等变。我们调查的各种类型的表示的一个gerbe上的模块层的堆栈上的对称群和相关的阿贝尔范畴层的gerbe(扭曲层)。

英文摘要:

We explore a new direction in representation theory which comes from holomorphic gerbes on complex tori. The analogue of the theta group of a holomorphic line bundle on a (compact) complex torus is developed for gerbes in place of line bundles. The theta group of symmetries of the gerbe has the structure of a Picard groupoid. We calculate it explicitly as a central extension of the group of symmetries of the gerbe by the Picard groupoid of the underlying complex torus. We discuss obstruction to equivariance and give an example of a group of symmetries of a gerbe with respect to which the gerbe cannot be equivariant. We survey various types of representations of the group of symmetries of a gerbe on the stack of sheaves of modules on the gerbe and the associated abelian category of sheaves on the gerbe (twisted sheaves).

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