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arXiv 1808.02306math.NT
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调和Maass型的Borcherds提升与模积分

Borcherds lifts of harmonic Maass forms and modular integrals

Markus Schwagenscheidt

摘要:

我们扩展Borcherds的奇异θ电梯在签名$(1,2)$调和马斯形式的重量$1/2$的非全纯部分被允许是指数增长性在$i\infty$。我们确定的奇异性的电梯和计算其傅立叶展开。结果表明,升力是连续的,但不可微沿某些测地线在上半平面对应的非全纯主部的输入。作为应用,我们得到了Duke,Imamoglu和Tóth的权$2$模积分的高阶推广.此外,我们构造自守产品相关的谐波马斯形式。

英文摘要:

We extend Borcherds' singular theta lift in signature $(1,2)$ to harmonic Maass forms of weight $1/2$ whose non-holomorphic part is allowed to be of exponential growth at $i\infty$. We determine the singularities of the lift and compute its Fourier expansion. It turns out that the lift is continuous but not differentiable along certain geodesics in the upper half-plane corresponding to the non-holomorphic principal part of the input. As an application, we obtain a generalization to higher level of the weight $2$ modular integral of Duke, Imamoglu and Tóth. Further, we construct automorphic products associated to harmonic Maass forms.

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