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arXiv 2108.05286math.AG
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Drinfeld曲线的典范表示

The canonical representation of the Drinfeld curve

Lucas Laurent, Bernhard Köck

AI总结:

本文针对素数幂q下的Drinfeld曲线,在基域为有限域q的代数闭包、自同构群为SL₂(F_q)的情形下,解决了非驯分歧曲线覆叠的典范表示分解为不可分解表示直和的公开问题。

摘要:

若$C$是代数闭域$\bF$上的光滑射影曲线,$G$是$C$的自同构子群,则$G$通过拉回微分的方式,在全纯微分构成的$\bF$-向量空间$H^0\big(C,\u03a9_C\big)$上线性作用。换言之,$H^0\big(C,\u03a9_C\big)$是$G$在域$\bF$上的一个表示,称为$C$的**典范表示**。当曲线覆叠$C \u27f6 C/G$的分歧是非驯分歧时,计算其分解为不可分解表示直和的形式仍是一个公开问题。本文中,我们针对$C$为Drinfeld曲线${XY^q-X^qY-Z^{q+1}=0}$、$\bF=\bar{\bbF}_q$且${G=SL_2\big(\bbF_q\big)}$(其中$q$为素数幂)的情形,计算了该分解。

英文摘要:

If $C$ is a smooth projective curve over an algebraically closed field $\mathbb{F}$ and $G$ is a subgroup of automorphisms of $C$, then $G$ acts linearly on the $\mathbb{F}$-vector space of holomorphic differentials $H^0\big(C,Ω_C\big)$ by pulling back differentials. In other words, $H^0\big(C,Ω_C\big)$ is a representation of $G$ over the field $\mathbb{F}$, called $\textit{the canonical representation}$ of $C$. Computing its decomposition as a direct sum of indecomposable representations is still an open problem when the ramification of the cover of curves $C \longrightarrow C/G$ is wild. In this paper, we compute this decomposition for $C$ the Drinfeld curve ${XY^q-X^qY-Z^{q+1}=0}$, $\mathbb{F}=\bar{\mathbb{F}}_q$, and ${G=SL_2\big(\mathbb{F}_q\big)}$ where $q$ is a prime power.

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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