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Milne’s rationality conjecture and algebraic specialization

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Proves Milne’s rationality conjecture for abelian varieties over \(\overline{\mathbb Q}\) with good reduction: specialized Hodge classes pair rationally with complementary divisor products, independently of cohomology theory. Together with result 032, every specialized Hodge class is represented by a single rational algebraic cycle simultaneously in all prime-to-p and crystalline realizations, for every residue characteristic p.

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One current paper; one replaced by a later edition.

The paper states

Theorem 1.1

In Milne’s rationality conjecture for abelian varieties, 7 October 2026

Possible match to OpenAI’s description, selected from the papers’ main statements because it shares the most wording. No review confirming the selection is recorded.

Let A/\Qbar be an abelian variety of dimension d with good reduction A_0/\F at w. Let 0\leq r\leq d, and let

\gamma\in H^{2r}(A(\C),\Q(r))

be a rational Hodge class. For every list of Cartier divisors D_1,\ldots,D_{d-r} on A_0, there is a number q\in\Q such that

\begin{aligned}\Tr_\ell\bigl(\gamma_{0,\ell} c_{1,\ell}(D_1)\cdots c_{1,\ell}(D_{d-r})\bigr)&=q &&\text{in }\Q_\ell\quad(\ell\ne p),\\ \Tr_p\bigl(\gamma_{0,p} c_{1,\mathrm{cris}}(D_1)\cdots c_{1,\mathrm{cris}}(D_{d-r})\bigr)&=q &&\text{in }\Cw.\end{aligned}

Here \gamma_{0,\ell} is the smooth proper specialization of the \ell-adic realization, and \gamma_{0,p} is the de Rham–crystalline specialization in

H^{2r}_{\mathrm{cris}}(A_0/W(\F))[1/p](r) \otimes_{\Kzero}\Cw.

The traces use the top Tate twist and send the class of a zero-cycle to its degree. If r=d, the divisor product is 1.

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Milne’s rationality conjecture for abelian varieties

7 October 2026, current edition.

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This version updates a citation to a revised manuscript in this collection; see the previous version.

Earlier editions: 23 September 2026

We prove Milne’s rationality conjecture for abelian varieties, including residue characteristic 2. After good reduction, the pairing of a rational Hodge class with any complementary product of divisor classes on the reduction is the same rational number in every prime-to-p realization and in crystalline cohomology. Using the Hodge theorem for CM abelian varieties, we also show that every such specialized Hodge class is represented by a single rational algebraic cycle in all these realizations.

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