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Hasse norm principle for M11M_{11} and J1J_1 extensions

Published 17 Oct 2022 in math.NT and math.AG | (2210.09119v4)

Abstract: We give a necessary and sufficient condition for the Hasse norm principle for field extensions K/kK/k when the Galois groups Gal(L/k){\rm Gal}(L/k) of the Galois closure L/kL/k of K/kK/k are isomorphic to the Mathieu group M11M_{11} of degree $11$ of order $7920$ or the Janko group J1J_1 of order $175560$ by determining H<sup>1(k,</sup>Pic X‾)=0H<sup>1(k,{\rm</sup> Pic}\, \overline{X})=0 or Z/2Z\mathbb{Z}/2\mathbb{Z} for norm one tori T=R<sup>(1)K/k(Gm)T=R<sup>{(1)}_{K/k}(\mathbb{G}_m) with a smooth kk-compactification XX and X‾=X×kk‾\overline{X}=X\times_k\overline{k}. The result gives a first step towards understanding the all pictures of the Hasse norm principle for the $26$ sporadic simple groups.

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