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arXiv · 2104.09200

Une factorisation de la cohomologie compl\'et\'ee et du syst\`eme de Beilinson-Kato

Pierre Colmez·Shanwen Wang
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Abstract

We show that the modular symbol $(0,\infty)$, considered as an element of the dual of Emerton's completed cohomology, interpolates Kato's Euler system at classical points, and we deduce from this a factorisation of Beilinson-Kato's system as a product of two symbols $(0,\infty)$ (an algebraic analog of Rankin's method). The proof uses the $p$-adic local Langlands correspondence for ${\mathbf GL}_2({\mathbf Q}_p)$ and Emerton's factorization of the completed cohomology of the tower of modular curves for which we provide a new proof resting upon the construction of a Kirillov model for the completed cohomology, and which we refine by imposing conditions at classical points; the existence of such a refinement is a manifestation of an analyticity property for $p$-adic periods of modular forms.

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Pierre Colmez, Shanwen Wang. 2021-04-19. Une factorisation de la cohomologie compl\'et\'ee et du syst\`eme de Beilinson-Kato. https://arxiv.org/abs/2104.09200

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