The motivic-weight-22 classification conjecture for geometric Galois representations

From papers

Let VfV_f be the geometric Galois representation associated with a Hecke eigenform, and let ϕ1,,ϕ11\phi_1,\ldots,\phi_{11} be the representations associated with the 1111 automorphic representations in Theorem 1. Let L\mathbb L denote the Tate Galois representation, and let a representation have non-negative Hodge--Tate weights and motivic weight at most 2222. Classification conjecture. Every semisimple geometric Galois representation of motivic weight at most 2222, and with non-negative Hodge--Tate weights, is a direct sum of representations ϕj\phi_j for 1j111\leq j \leq 11 tensored with Lk\mathbb L^k for some k0k \geq 0. This is presented as part of the Langlands-program framework and is not established in the source; it would classify the relevant semisimple geometric Galois representations in terms of the listed automorphic ones.

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Primary source

Jonas Bergström and Carel Faber, “Cohomology of moduli spaces via a result of Chenevier and Lannes”, arXiv:2207.05130 (2023).

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