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arXiv 1106.4249math.NTmath.RT
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关于Shalika模型的算法及${\rm GL}(2n)$的$L$ -函数的临界值

On the arithmetic of Shalika models and the critical values of $L$-functions for ${\rm GL}(2n)$

Harald Grobner, A. Raghuram

摘要:

设$Π$是全实数域$F$上${\rm GL}_{2n}(\mathbb A)$的上同调尖点自守表示.假设$Π$有一个Shalika模型。在$Π_f$的Shalika模型上定义了一个合理的结构。通过与$Π_f$的尖点上同调实现的有理结构的比较,定义了周期$ω^ε(Π_f)$ .我们描述的行为,这样的顶级时期扭转$Π$的代数Hecke字符$χ$的$F$。然后我们证明了标准$L$ -函数$L(s, Π\otimes χ)$的所有临界值的代数性结果;这里我们使用B.太阳上的不灭一定量附着在$Π_\infty$上。作为应用,我们在以下情况下得到了新的代数性结果:第一,对于对称立方$L$ -函数,我们还讨论了高对称幂的情形.其次,对于${\rm GL}_3 \times {\rm GL}_2$的Rankin-Selberg $L$ -函数;假设Langlands泛函,这推广到${\rm GL}_n \times {\rm GL}_{n-1}$的Rankin-Selberg $L$ -函数。第三,对于度为四的$L$ -函数为${\rm GSp}_4$。此外,我们比较了我们的顶级度期间与其他作者定义的期间。我们还证明了我们的主要定理与Deligne和Gross的定理是相容的。

英文摘要:

Let $Π$ be a cohomological cuspidal automorphic representation of ${\rm GL}_{2n}(\mathbb A)$ over a totally real number field $F$. Suppose that $Π$ has a Shalika model. We define a rational structure on the Shalika model of $Π_f$. Comparing it with a rational structure on a realization of $Π_f$ in cuspidal cohomology in top-degree, we define certain periods $ω^ε(Π_f)$. We describe the behaviour of such top-degree periods upon twisting $Π$ by algebraic Hecke characters $χ$ of $F$. Then we prove an algebraicity result for all the critical values of the standard $L$-functions $L(s, Π\otimes χ)$; here we use the work of B. Sun on the non-vanishing of a certain quantity attached to $Π_\infty$. As an application, we obtain new algebraicity results in the following cases: Firstly, for the symmetric cube $L$-functions attached to holomorphic Hilbert modular cusp forms; we also discuss the situation for higher symmetric powers. Secondly, for Rankin-Selberg $L$-functions for ${\rm GL}_3 \times {\rm GL}_2$; assuming Langlands Functoriality, this generalizes to Rankin-Selberg $L$-functions of ${\rm GL}_n \times {\rm GL}_{n-1}$. Thirdly, for the degree four $L$-functions for ${\rm GSp}_4$. Moreover, we compare our top-degree periods with periods defined by other authors. We also show that our main theorem is compatible with conjectures of Deligne and Gross.

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