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arXiv 1502.01869math.AGhep-thmath-phmath.MPmath.RT
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等变膜

Equivariant branes

Andrés Viña

摘要:

给定一个作用于群$G$的Calabi-Yau流形$X$,并考虑$X$上的$B$ -膜作为凝聚层的导出范畴中的对象,给出了等变膜的定义,推广了等变层的概念.我们还提出了等变膜的等变荷的定义。连接膜${\mathcal F}$和${\mathcal G}$的弦空间是群$Ext^i({\mathcal F},\,{\mathcal G})$。证明了两个$G$ -等变膜之间的弦空间支持$G$的表示.因此,这些空间可以分解为$G$ -作用的不变空间的直和。当$X$是复曲面簇和当$X$是半单李群的旗流形时,我们给出了一些特殊的分解。

英文摘要:

Given a Calabi-Yau manifold $X$ acted by a group $G$ and considering the $B$-branes on $X$ as objects in the derived category of coherent sheaves, we give a definition of equivariant branes, which generalizes the concept of equivariant sheaves. We also propose a definition of equivariant charge of an equivariant brane. The spaces of strings joining the branes ${\mathcal F}$ and ${\mathcal G}$, are the groups $Ext^i({\mathcal F},\,{\mathcal G})$. We prove that the spaces of strings between two $G$-equivariant branes support representations of $G$. Thus, these spaces can be decomposed in direct sum of invariant spaces for the $G$-action. We show some particular decompositions, when $X$ is a toric variety and when $X$ is a flag manifold of a semisimple Lie group.

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