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arXiv 1402.0184math.RT
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K为特征为2的局部函数域的SL_2(K)的L-包与深度

L-packets and depth for SL_2(K) with K a local function field of characteristic 2

Sergio Mendes, Roger Plymen

摘要:

设G = SL_2(K),K是特征为2的局部函数域.我们回顾了关于域K的Artin-Schreier理论,并证明了这导致了G的光滑对偶中某些L-包的参数化。我们将此与最近的几何猜想。主列中的L-包由二次扩张参数化,基数为4的超尖点L-包由双二次扩张参数化。每个基数为4的超尖点包都伴随着SL_1(D)的单例包。我们计算了SL_2(K)及其内部形式SL_1(D)的所有这些L-包的不可约分支的深度。

英文摘要:

Let G = SL_2(K) with K a local function field of characteristic 2. We review Artin-Schreier theory for the field K, and show that this leads to a parametrization of certain L-packets in the smooth dual of G. We relate this to a recent geometric conjecture. The L-packets in the principal series are parametrized by quadratic extensions, and the supercuspidal L-packets of cardinality 4 are parametrized by biquadratic extensions. Each supercuspidal packet of cardinality 4 is accompanied by a singleton packet for SL_1(D). We compute the depths of the irreducible constituents of all these L-packets for SL_2(K) and its inner form SL_1(D).

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