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arXiv 1609.04898math.AG
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广义Fermat曲线的模域

Field of moduli of generalized Fermat curves

Sebastián Reyes-Carocca

摘要:

作为Riemann-Roch定理的结果,闭Riemann曲面$S$可以由非奇异复射影代数曲线$C$来描述。$S$的定义字段是$\mathbb{C}$的任何子字段$D$,从而我们可以选择由$D[x_0, \ldots, x_n]$中的多项式定义的$C$。$S$的模域是${\mathbb R}$当且仅当$S$容许反共形自同构。如果$S$的模域是${\mathbb R}$,则$S$可以定义在模域上当且仅当$S$允许反共形对合。模域可能不是定义域。本文考虑一类闭黎曼曲面,称为广义Fermat曲线。这些表面是某些orbifolds的最高Abel分支覆盖。在这类黎曼曲面,我们研究的问题,决定当该领域的模是${\mathbb R}$,当在这种情况下,它是一个领域的定义。

英文摘要:

As a consequence of the Riemann-Roch theorem, a closed Riemann surface $S$ can be described by a non-singular complex projective algebraic curve $C$. A field of definition for $S$ is any subfield $D$ of $\mathbb{C}$ so that we may choose $C$ to be defined by polynomials in $D[x_0, \ldots, x_n]$. The field of moduli of $S$ is ${\mathbb R}$ if and only if $S$ admits an anticonformal automorphism. In the case that the field of moduli of $S$ is ${\mathbb R}$, then $S$ can be defined over the field of moduli if and only if $S$ admits an anticonformal involution. It may happen that the field of moduli is not a field of definition. In this paper, we consider certain class of closed Riemann surfaces, called generalized Fermat curves. These surfaces are the highest Abelian branched cover of certain orbifolds. In this class of Riemann surfaces, we study the problem of deciding when the field of moduli is ${\mathbb R}$ and when, in such a case, it is a field of definition.

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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