Weights conjecture for intersection cohomology of rigid-analytic varieties

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 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 IHci\operatorname{IH}^i_c and IHi\operatorname{IH}^i denote compactly supported and ordinary intersection cohomology. Weights conjecture. For any gGηg\in G_\eta projecting to geometric Frobenius in GsG_s and any integer i0i\geq0, the eigenvalues of gg on

IHci(Xηˉ;\Q)\operatorname{IH}^i_c(X_{\bar\eta};\Q_\ell)

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

IHi(Xηˉ;\Q)\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,\Q)\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.

Sources & referencesView supporting material

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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