Global localization conjecture for weight-one Kato homology

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Let FF be a global field, let FvF_v be the completion at a place vv, and set Xv:=X⊗FFvX_v:=X\otimes_F F_v. Let p=ch⁡(F)p=\operatorname{ch}(F) and r≥1r\geq 1.

Global localization conjecture. For j>0j>0, there is an isomorphism

KHj(1)(X,Z/pr)→≃⨁vKHj(1)(Xv,Z/pr),KH_j^{(1)}(X,\mathbb{Z}/p^r)\xrightarrow{\simeq}\bigoplus_v KH_j^{(1)}(X_v,\mathbb{Z}/p^r),

and for j=0j=0 there is a short exact sequence

0→KH0(1)(X,Z/pr)→⨁vKH0(1)(Xv,Z/pr)→Z/pr→0,0\to KH_0^{(1)}(X,\mathbb{Z}/p^r)\to\bigoplus_v KH_0^{(1)}(X_v,\mathbb{Z}/p^r)\to\mathbb{Z}/p^r\to0,

where vv runs over all places of FF. This is a local-global description of the weight-one Kato homology groups.

References

Primary source

Toshiro Hiranouchi and Rin Sugiyama, “Extended differential symbol and the Kato homology groups”, arXiv:2501.11224 (2025).

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