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arXiv 1206.1102math.NT
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关于局部调和Maass型的完备generating function

On a completed generating function of locally harmonic Maass forms

Kathrin Bringmann, Ben Kane, Sander Zwegers

摘要:

在研究土井-长沼提升时,Zagier定义了积分权尖点形式$f_D$,它自然地定义在判别式$D$的二元二次型中。后来Kohnen和Zagier确定了$f_D$的生成函数是半积分权尖点形式。一个自然的原像$f_D$下的微分算子的核心理论的调和弱马斯形式确定的前两个作者和Kohnen。在本文中,我们考虑这些原像的生成函数的模性质。我们证明了虽然生成函数不是itelf模,但它可以自然地完成,得到一个半整数权模对象。

英文摘要:

While investigating the Doi-Naganuma lift, Zagier defined integral weight cusp forms $f_D$ which are naturally defined in terms of binary quadratic forms of discriminant $D$. It was later determined by Kohnen and Zagier that the generating function for the $f_D$ is a half-integral weight cusp form. A natural preimage of $f_D$ under a differential operator at the heart of the theory of harmonic weak Maass forms was determined by the first two authors and Kohnen. In this paper, we consider the modularity properties of the generating function of these preimages. We prove that although the generating function is not itelf modular, it can be naturally completed to obtain a half-integral weight modular object.

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