Weights conjecture for intersection cohomology of rigid-analytic varieties

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Let KK be a pp-adic local field with residue field of cardinality qq, let XX be a quasi-compact and quasi-separated rigid-analytic KK-variety of dimension dd, and let ℓ≠p\ell\neq p be a prime number. Let GηG_\eta and GsG_s denote the relevant generic- and special-fiber Galois groups, and let IH⁡ci\operatorname{IH}^i_c and IH⁡i\operatorname{IH}^i denote compactly supported and ordinary intersection cohomology. Weights conjecture. For any g∈Gηg\in G_\eta projecting to geometric Frobenius in GsG_s and any integer i≥0i\geq0, the eigenvalues of gg on

IH⁡ci(Xηˉ;\Qℓ)\operatorname{IH}^i_c(X_{\bar\eta};\Q_\ell)

are qq-Weil numbers of weights at most 2i+d2i+d, and the eigenvalues on

IH⁡i(Xηˉ;\Qℓ)\operatorname{IH}^i(X_{\bar\eta};\Q_\ell)

are qq-Weil numbers of weights at least 00. In particular, when XX is smooth and proper, the eigenvalues on Hi(Xηˉ‾,\Qℓ)\rm{H}^i(X_{\overline{\bar\eta}},\Q_\ell) have weights between 00 and 2i2i. This conjecture extends known weight bounds from algebraic varieties to general quasi-compact quasi-separated rigid-analytic varieties; the smooth proper algebraic case is noted in the source as known via alterations and semistable results, while the analytic assertion remains open.

References

Primary source

David Hansen and Bogdan Zavyalov, “Arithmetic Properties Of -adic Étale Cohomology and Nearby Cycles of Rigid-Analytic Spaces”, arXiv:2301.01800 (2025).

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