Weight-monodromy conjecture for smooth proper varieties over local fields

Let XX be a proper, smooth, separated scheme of finite type over a non-Archimedean local field KK, let ll be a prime different from the residue characteristic, and let MM_\bullet be the monodromy filtration on Heˊti(XK,Ql)\operatorname{H}^i_{\text{\scriptsize ét}}(X_{\overline{K}},\operatorname{\mathbf{Q}}_l). Writing qq for the cardinality of the residue field and Frq\mathrm{Fr}_q for geometric Frobenius, the graded piece is GrjMHeˊti(XK,Ql)\operatorname{Gr}_j^M \operatorname{H}^i_{\text{\scriptsize ét}}(X_{\overline{K}},\operatorname{\mathbf{Q}}_l). Weight-monodromy conjecture. The eigenvalues of Frq\mathrm{Fr}_q on GrjMHeˊti(XK,Ql)\operatorname{Gr}_j^M \operatorname{H}^i_{\text{\scriptsize ét}}(X_{\overline{K}},\operatorname{\mathbf{Q}}_l) are algebraic numbers whose conjugates all have complex absolute values equal to q(i+j)/2q^{(i+j)/2}. This filtration is known to coincide with the weight-monodromy filtration for curves, where the conjecture was proved by Grothendieck; the status supplied for this candidate therefore records the claim as resolved.

Sources & referencesView supporting material

Primary source

Jan Vonk, “Stable models of Hecke operators”, arXiv:1501.03488 (2015).

Additional references

2 papers in this index state this conjecture (2002–2015). The statement above is taken from the most recent of them; the others are arXiv:math/0212109.

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