schema_version: 1 title: 'Hodge Classes on Abelian Sixfolds: Constructions and a Conditional Proof' abstract: A twenty-one-case research draft on rational Hodge classes of complex abelian sixfolds. The overall sixfold conclusion is conditional on the manuscript-specific split-eightfold Weil, CM, complete Kuga–Satake and auxiliary spin-tensor algebraicity assertions. Individual unconditional strata and all-powers results have the narrower scopes recorded in the manuscript and theorem registry; no unconditional resolution is claimed. field: Algebraic geometry license: CC-BY-4.0 type: paper authors: - eggtea keywords: - Hodge conjecture - abelian sixfolds - conditional proof main: 1_paper.pdf takeaways: takeaways.md verification: - type: review path: verification/review.md status: materials-present-not-independently-verified model: GPT-6 (Codex; exact runtime variant not exposed) date: '2026-10-17' scope: Statement, assumptions, public-summary and supplied-review provenance audit; not a complete fresh proof review. references: - title: Galois Groups of CM Fields in Degrees 24, 28, and 30 authors: A. P. Borselli url: https://preserve.lehigh.edu/lehigh-scholarship/graduate-publications-theses-dissertations/theses-dissertations/galois-groups-cm - title: Notes on Mumford--Tate groups authors: B. Moonen url: https://www.math.ru.nl/~bmoonen/Lecturenotes/CEBnotesMT.pdf - title: Hodge classes on abelian varieties of low dimension authors: B. Moonen and Yu. G. Zarhin url: https://arxiv.org/abs/math/9901113 - title: Introduction to Shimura Varieties authors: J. S. Milne url: https://www.jmilne.org/math/xnotes/svi.pdf - title: Special subvarieties arising from families of cyclic covers of the projective line authors: B. Moonen url: https://arxiv.org/abs/1006.3400 - title: On the Hodge conjecture for products of certain surfaces authors: J. J. Ramón Marí url: https://arxiv.org/abs/math/0505357 - title: Generic cycles, Lefschetz representations, and the generalized Hodge and Bloch conjectures for abelian varieties authors: C. Vial url: https://arxiv.org/abs/1803.00857 - title: Lefschetz classes on abelian varieties authors: J. S. Milne url: https://www.jmilne.org/math/articles/1999a.html - title: The Tate and standard conjectures for certain abelian varieties authors: J. S. Milne url: https://www.jmilne.org/math/articles/tcav2.pdf - title: Commensurability among Deligne--Mostow monodromy groups authors: C. Yu and Z. Zheng url: https://arxiv.org/abs/2411.09682v2 - title: Cycles on abelian $2n$-folds of Weil type from secant sheaves on abelian $n$-folds authors: E. Markman url: https://arxiv.org/abs/2502.03415v2 - title: On the index of degeneracy of a CM abelian variety authors: H. Yanai url: https://www.numdam.org/articles/10.5802/jtnb.925/ - title: Secant sheaves and Weil classes on abelian varieties authors: E. Markman url: https://arxiv.org/abs/2509.23403v2 - title: Algebraicity of Weil classes on split abelian eightfolds authors: OpenAI url: https://github.com/openai/math/blob/main/preprints/Algebraicity-of-Weil-classes-on-split-abelian-eightfolds-September-18-2026/README.md - title: The rational Hodge conjecture for CM abelian varieties authors: OpenAI url: https://github.com/openai/math/blob/main/preprints/The-rational-Hodge-conjecture-for-CM-abelian-varieties-September-30-2026/README.md - title: Weil classes and Hodge classes on abelian powers authors: OpenAI url: https://github.com/openai/math/blob/main/preprints/Weil-classes-and-Hodge-classes-on-abelian-powers-September-30-2026/README.md - title: Algebraicity of Kuga--Satake Correspondences for K3 Surfaces authors: OpenAI url: https://github.com/openai/math/blob/main/preprints/Algebraicity-of-Kuga-Satake-Correspondences-for-K3-Surfaces-October-3-2026/README.md - title: Lectures on K3 Surfaces authors: D. Huybrechts url: https://www.math.uni-bonn.de/people/huybrech/K3Global.pdf - title: The rational Hodge conjecture for products of K3 surfaces authors: OpenAI url: https://github.com/openai/math/blob/adc7f1241b42e322a6451854ab7e4b4c146bf78a/preprints/The-rational-Hodge-conjecture-for-products-of-K3-surfaces-October-4-2026/build/manuscript/auxiliary.tex