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arXiv 1507.00745math.RTmath.NT
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基于Tate上同调的局部碱基变化

Local Base Change via Tate Cohomology

Niccolò Ronchetti

摘要:

本文提出了特征零局部域素度扩张的循环基变换(Langlands函性的一种特殊情况)的一种新的实现方法。设$F / E$是剩余特征$p \neq l$的局部域的素度$l$扩张.设$π$是$\mathrm{GL}_n(E)$的不可约尖点$l$ -adic表示,$ρ$是$\mathrm{GL}_n(F)$的不可约尖点$l$ -adic表示,它是伽罗瓦不变的.在$π$和$ρ$的一些次要技术条件下(例如,我们假设两者都是零级),我们证明了$\bmod l$ -约化$r_l(π)$和$r_l(ρ)$是在基变化中当且仅当$ρ$关于伽罗瓦作用的Tate上同调是同构的,作为$\mathrm{GL}_n(E)$的模表示,到$r_l(π)$的Frobenius扭曲。这证明了一个特殊的情况下猜想的Treumann和Venkatesh,因为他们调查之间的关系联系和朗兰兹函。

英文摘要:

In this paper we propose a new way to realize cyclic base change (a special case of Langlands functoriality) for prime degree extensions of characteristic zero local fields. Let $F / E$ be a prime degree $l$ extension of local fields of residue characteristic $p \neq l$. Let $π$ be an irreducible cuspidal $l$-adic representation of $\mathrm{GL}_n(E)$ and $ρ$ be an irreducible cuspidal $l$-adic representation of $\mathrm{GL}_n(F)$ which is Galois-invariant. Under some minor technical conditions on $π$ and $ρ$ (for instance, we assume that both are level zero) we prove that the $\bmod l$-reductions $r_l(π)$ and $r_l(ρ)$ are in base change if and only if the Tate cohomology of $ρ$ with respect to the Galois action is isomorphic, as a modular representation of $\mathrm{GL}_n(E)$, to the Frobenius twist of $r_l(π)$. This proves a special case of a conjecture of Treumann and Venkatesh as they investigate the relationship between linkage and Langlands functoriality.

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