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arXiv 0910.3128math.NT
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γ因子的表征:浅井案例

Characterization of γ-factors: the Asai case

Guy Henniart, Luis Lomelí

摘要:

设$E$是正特征局部紧域$F$的可分二次扩张.对${\rm GL}_n(E)$的光滑不可约表示π定义了Asai γ-因子.若σ是局部Langlands对应下对应于π的$\mathcal{W}_E$的Weil-Deligne表示,我们证明了Asai γ-因子与诱导张量下由σ得到的$\mathcal{W}_F$的Weil-Deligne表示的Deligne-Langlands γ-因子相同.这是通过证明Asai γ-因子的局部性质以及它们在$L$ -函数的全局函数方程中的作用来实现的。作为直接应用,我们利用高度分歧特征标建立了γ-因子在扭曲下的稳定性.

英文摘要:

Let $E$ be a separable quadratic extension of a locally compact field $F$ of positive characteristic. Asai γ-factors are defined for smooth irreducible representations πof ${\rm GL}_n(E)$. If σis the Weil-Deligne representation of $\mathcal{W}_E$ corresponding to πunder the local Langlands correspondence, we show that the Asai γ-factor is the same as the Deligne-Langlands γ-factor of the Weil-Deligne representation of $\mathcal{W}_F$ obtained from σunder tensor induction. This is achieved by proving that Asai γ-factors are characterized by their local properties together with their role in global functional equations for $L$-functions. As an immediate application, we establish the stability property of γ-factors under twists by highly ramified characters.

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