The pp-adic Tate conjecture for crystalline cohomology

Let XX be a smooth projective variety over the finite field k=Fqk=\operatorname{\mathbb{F}}_q of characteristic pp, with q=pmq=p^m. Let W(k)W(k) be the ring of pp-typical Witt vectors, let K=W(k)[1/p]K=W(k)[1/p], and let Hcrys(X):=Hcrys(X/W(k))W(k)KH^{\ast}_{\operatorname{crys}}(X):=H^{\ast}_{\operatorname{crys}}(X/W(k))\otimes_{W(k)}K. Let Frp\operatorname{Fr}_p denote crystalline Frobenius. pp-adic Tate conjecture. The cycle class map

CH(X)QpHcrys2(X)()Frp\operatorname{CH}^{\ast}(X)\otimes\operatorname{\mathbb{Q}}_p\to {H^{2\ast}_{\operatorname{crys}}(X)(\ast)}^{\operatorname{Fr}_p}

with values in the Qp\operatorname{\mathbb{Q}}_p-vector subspace fixed by Frp\operatorname{Fr}_p is surjective. This is the crystalline formulation of the Tate conjecture over finite fields and remains open in general.

Sources & referencesView supporting material

Primary source

Satoshi Mochizuki, “Cycle maps on cohomology theories for dg-categories and their applications”, arXiv:2002.04373 (2020).

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