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arXiv 1803.10550math.NT
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Weil表示的Eisenstein级数

Eisenstein series for the Weil representation

Markus Schwagenscheidt

摘要:

本文计算了偶格上向量值Eisenstein级数的Weil表示的Fourier展开式。为此,我们定义某些扭曲的Dirichlet字符通常爱森斯坦系列相关联的各向同性元素的判别式形式的基础晶格。这些扭曲的功能仍然形成一个生成系统的空间的爱森斯坦级数,但有更好的乘法性质比个人爱森斯坦级数。我们适应的Bruinier和Kuss的方法,以获得特殊值的Dirichlet $L$-函数和代表数模的基本格素数幂的扭曲爱森斯坦级数的傅立叶系数的代数公式。特别地,我们得到了各个Eisenstein级数的傅里叶系数是有理数。此外,我们还证明了扭Eisenstein级数是Bruinier和Stein引入的向量值模形式上的Hecke算子的本征形.

英文摘要:

We compute the Fourier expansion of vector valued Eisenstein series for the Weil representation associated to an even lattice. To this end, we define certain twists by Dirichlet characters of the usual Eisenstein series associated to isotropic elements in the discriminant form of the underlying lattice. These twisted functions still form a generating system for the space of Eisenstein series but have better multiplicative properties than the individual Eisenstein series. We adapt a method of Bruinier and Kuss to obtain algebraic formulas for the Fourier coefficients of the twisted Eisenstein series in terms of special values of Dirichlet $L$-functions and representation numbers modulo prime powers of the underlying lattice. In particular, we obtain that the Fourier coefficients of the individual Eisenstein series are rational numbers. Additionally, we show that the twisted Eisenstein series are eigenforms of the Hecke operators on vector valued modular forms introduced by Bruinier and Stein.

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