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arXiv 2209.00488math.NT
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尖点形式的标量值深度二 Eichler-Shimura 积分

Scalar-valued depth two Eichler-Shimura Integrals of Cusp Forms

Tobias Magnusson, Martin Raum

AI总结:

本文定义了深度二全纯迭代 Eichler-Shimura 积分 $I_{f,g}$,构造了以其为顶部分量的向量值模形式,导出可有效计算的标量值深度二积分 $\mathcal{E}_{f,g}$,并解释了周期多项式的正交关系。

摘要:

给定整权 $k \geq 2$ 的尖点形式 $f$ 和 $g$,深度二全纯迭代 Eichler-Shimura 积分 $I_{f,g}$ 定义为 ${\int_τ^{i\infty}f(z)(X-z)^{k-2}I_g(z;Y)\mathrm{d}z}$,其中 $I_g$ 是 $g$ 的 Eichler 积分,$X,Y$ 是形式变量。我们提供了一个显式的向量值模形式,其顶部分量由 $I_{f,g}$ 给出。我们证明了该向量值模形式产生了一个标量值深度二迭代 Eichler 积分,记为 $\mathcal{E}_{f,g}$,可被视为深度一标量值 Eichler 积分 $\mathcal{E}_f$ 的高深度推广。附带地,我们的论证为 Paşol-Popa 最初提出的周期多项式所满足的正交关系提供了一种替代性解释。我们证明了 $\mathcal{E}_{f,g}$ 在乘以判别式模形式 $Δ$ 的适当幂次后,可表示为向量值 Eisenstein 级数分量与经典模形式乘积之和。这使得 $\mathcal{E}_{f,g}$ 能够被有效计算。

英文摘要:

Given cusp forms $f$ and $g$ of integral weight $k \geq 2$, the depth two holomorphic iterated Eichler-Shimura integral $I_{f,g}$ is defined by ${\int_τ^{i\infty}f(z)(X-z)^{k-2}I_g(z;Y)\mathrm{d}z}$, where $I_g$ is the Eichler integral of $g$ and $X,Y$ are formal variables. We provide an explicit vector-valued modular form whose top components are given by $I_{f,g}$. We show that this vector-valued modular form gives rise to a scalar-valued iterated Eichler integral of depth two, denoted by $\mathcal{E}_{f,g}$, that can be seen as a higher-depth generalization of the scalar-valued Eichler integral $\mathcal{E}_f$ of depth one. As an aside, our argument provides an alternative explanation of an orthogonality relation satisfied by period polynomials originally due to Paşol-Popa. We show that $\mathcal{E}_{f,g}$ can be expressed in terms of sums of products of components of vector-valued Eisenstein series with classical modular forms after multiplication with a suitable power of the discriminant modular form $Δ$. This allows for effective computation of $\mathcal{E}_{f,g}$.

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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