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arXiv · 2609.12110

Poincaré duality for pro-étale $\mathbf{Q}_p$-local systems

Shizhang Li·Wiesława Nizioł·Emanuel Reinecke·Bogdan Zavyalov
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Abstract

We prove finiteness and Poincaré duality for pro-étale $\mathbf{Q}_p$-local systems on proper $p$-adic rigid-analytic spaces in the framework of Banach--Colmez spaces and establish their optimal cohomological vanishing bounds. As a consequence, we also obtain ordinary finiteness and duality for their arithmetic pro-étale cohomology. We deduce these results from their analogs for perfect complexes on the Fargues--Fontaine curve, which in turn reduce to Poincaré duality for perfect complexes over period rings. We give a simple proof of the latter duality via the same diagrammatic argument as in our previous work for finite coefficients. Along the way, we establish optimal $v$-descent for perfect complexes over certain period rings on affinoid perfectoid spaces.

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Shizhang Li, Wiesława Nizioł, Emanuel Reinecke, Bogdan Zavyalov. 2026-09-10. Poincaré duality for pro-étale $\mathbf{Q}_p$-local systems. https://arxiv.org/abs/2609.12110

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