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arXiv math/0402111math.NT
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Gal(Qbar/Q)的某些l-adic表示

On some l-adic representations of Gal(Qbar/Q) attached to noncongruence subgroups

A. J. Scholl

摘要:

SL_2(Z)的非同余子群上的l-adic抛物上同调群是Gal(Qbar/F)对数域F的有限维表示.我们展示的例子(F=Q)产生的伽罗瓦表示的图像是开子群的完全群的辛相似(任意维)。伽罗瓦群的象的确定依赖于Katz关于包含主幂零元元的gl(N)的约化子代数的分类定理;本文还包含了I.格罗诺夫斯基

英文摘要:

The l-adic parabolic cohomology groups attached to noncongruence subgroups of SL_2(Z) are finite-dimensional representations of Gal(Qbar/F) for some number field F. We exhibit examples (with F=Q) giving rise to Galois representations whose images are open subgroups of the full group of symplectic similitudes (of arbitrary dimension). The determination of the image of the Galois group relies on Katz's classification theorem for reductive subalgebras of gl(N) containing a principal nilpotent element; the paper also contains a short conceptual proof of this theorem, suggested by I. Gronowski.

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