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arXiv · 1811.11544

Galois representations associated with a non-selfdual automorphic representation of GL(3)

Tetsushi Ito·Teruhisa Koshikawa·Yoichi Mieda
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Abstract

In 1994, van Geemen and Top constructed a non-selfdual motive of rank three over $\mathbb{Q}$ conjecturally associated with a cuspidal non-selfdual automorphic representation of $\mathrm{GL}_3(\mathbb{A}_{\mathbb{Q}})$ of level $\Gamma_0(128)$. They experimentally confirmed the coincidence of the local $L$-factors at finitely many primes using computer. In this paper, we shall prove the coincidence of the local $L$-factors at every prime. To show this, we use the recent results of Harris-Lan-Taylor-Thorne and Scholze on the construction of Galois representations, and Greni\'e's results to compare three-dimensional $2$-adic Galois representations. We also prove the local-global compatibility at $p = 2$, including the case $p = \ell$.

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Tetsushi Ito, Teruhisa Koshikawa, Yoichi Mieda. 2018-11-28. Galois representations associated with a non-selfdual automorphic representation of GL(3). https://arxiv.org/abs/1811.11544

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