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arXiv 1607.04581math.AG
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关于A-超几何函数的局部单值性及某些单值不变子空间

On the local monodromy of A-hypergeometric functions and some monodromy invariant subspaces

María-Cruz Fernández-Fernández

摘要:

本文给出了$A$ -超几何函数关于绕坐标超平面$x_i =0$的小圈的局部单值性的特征多项式的显式公式。这个公式类似于Ando,Esterov和Takeuchi在无穷远处的局部单值性公式。我们的证明是组合的,可以适应后一个公式以及提供一个替代的证明。另一方面,我们还证明了某些非正则不可约$A$ -超几何$D$-模的解空间在非奇点处具有非平凡的整体单值不变子空间.

英文摘要:

We obtain an explicit formula for the characteristic polynomial of the local monodromy of $A$-hypergeometric functions with respect to small loops around a coordinate hyperplane $x_i =0$. This formula is similar to the one obtained by Ando, Esterov and Takeuchi for the local monodromy at infinity. Our proof is combinatorial and can be adapted to provide an alternative proof for the latter formula as well. On the other hand, we also prove that the solution space at a nonsingular point of certain irregular and irreducible $A$--hypergeometric $D$--modules has a nontrivial global monodromy invariant subspace.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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