Geisser's finiteness conjecture for Kato homology with Q/Z\mathbb Q/\mathbb Z coefficients

Let XX be smooth and projective over a finite field, and let HiK(X,Q/Z(1))H_i^K(X,\mathbb Q/\mathbb Z(1)) denote Kato homology in weight 11. Write CH1(X)Q=CH1(X)QCH_1(X)_{\mathbb Q}=CH_1(X)\otimes\mathbb Q, and let corank\operatorname{corank} denote the corank of a torsion group. Kato-homology finiteness conjecture in weight 11. The group HiK(X,Q/Z(1))H_i^K(X,\mathbb Q/\mathbb Z(1)) is finite for every i2i\ne 2, while

corankH2K(X,Q/Z(1))=dimCH1(X)Q.\operatorname{corank} H_2^K(X,\mathbb Q/\mathbb Z(1))=\dim CH_1(X)_{\mathbb Q}.

The conjecture predicts precise finiteness except in the degree governed by the rational one-cycle group; its general status is open.

Sources & referencesView supporting material

Primary source

Thomas H Geisser, “Finite generation conjectures for cohomology over finite fields”, arXiv:1103.5544 (2011).

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