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arXiv 1012.4825math.NT
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椭圆函数域的自守形式

Automorphic forms for elliptic function fields

Oliver Lorscheid

摘要:

设$F$是$\F_q$上椭圆曲线$X$的函数域。本文计算了作用于$F$上自守形式的非分歧Hecke算子的显式公式.我们确定这些公式中的语言的图形的Hecke算子,我们使用它的解释在$¶^1$ -丛$X$。这允许纯几何方法,其中涉及对$X$上的$¶^1$束的分类。我们应用计算公式计算了非分歧尖点型空间的维数和尖点型的支集。我们证明了尖点Hecke本征形在平凡$¶^1$ -丛中不为零。进一步,我们确定了非分歧$F'$ -环面自守形式的空间,其中$F'$是$F$的二次常数域扩张.它不包含非平凡的尖点形式。对某些Hecke $L$ -级数的零点的研究得出这样的结论:未分歧的环面自守形式的空间被Eisenstein级数$E(\blanc,s)$所张成,其中$s+1/2$是$X$的zeta函数的零点-在$q$是偶数且类数$h$等于$q+1$的情况下有一个可能的例外.

英文摘要:

Let $F$ be the function field of an elliptic curve $X$ over $\F_q$. In this paper, we calculate explicit formulas for unramified Hecke operators acting on automorphic forms over $F$. We determine these formulas in the language of the graph of an Hecke operator, for which we use its interpretation in terms of $¶^1$-bundles on $X$. This allows a purely geometric approach, which involves, amongst others, a classification of the $¶^1$-bundles on $X$. We apply the computed formulas to calculate the dimension of the space of unramified cusp forms and the support of a cusp form. We show that a cuspidal Hecke eigenform does not vanish in the trivial $¶^1$-bundle. Further, we determine the space of unramified $F'$-toroidal automorphic forms where $F'$ is the quadratic constant field extension of $F$. It does not contain non-trivial cusp forms. An investigation of zeros of certain Hecke $L$-series leads to the conclusion that the space of unramified toroidal automorphic forms is spanned by the Eisenstein series $E(\blanc,s)$ where $s+1/2$ is a zero of the zeta function of $X$---with one possible exception in the case that $q$ is even and the class number $h$ equals $q+1$.

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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