The tensor-induction local-global compatibility conjecture

Let K=FvK=F_v be unramified, let π\pi be an automorphic admissible smooth representation of GL2(K){\rm GL}_2(K) over F\mathbb{F}, and let rv\overline{r}_v be its corresponding local Galois representation. Let DA(π)D_A(\pi) be the associated étale (φ,OK×)(\varphi,\mathcal{O}_K^\times)-module over AA, and let DA(rv(1))D_A^\otimes(\overline{r}_v(1)) be the module attached to the tensor induction of the twist rv(1)\overline{r}_v(1). The tensor-induction compatibility conjecture. There is an isomorphism of étale (φ,OK×)(\varphi,\mathcal{O}_K^\times)-modules over AA,

DA(π)DA(rv(1)).D_A(\pi)\cong D_A^\otimes(\overline{r}_v(1)).

This is the paper's proposed local-global compatibility statement; the surrounding theorem proves it under semisimplicity and sufficient genericity assumptions, while the conjecture removes those assumptions.

Sources & referencesView supporting material

Primary source

Christophe Breuil, Florian Herzig, Yongquan Hu, Stefano Morra and Benjamin Schraen, “Multivariable (φ,O_K^)-modules and local-global compatibility”, arXiv:2211.00438 (2024).

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