Larsen's infinite-rank conjecture for abelian varieties over algebraic extensions

Let K/QK/\mathbb{Q} be an algebraic extension with finitely generated absolute Galois group GKG_K, and let AA be a non-zero abelian variety over KK. Define

rank(A(K))=dimQ(A(K)Q).\operatorname{rank}(A(K))=\dim_{\mathbb{Q}}(A(K)\otimes\mathbb{Q}).

Larsen's conjecture. Then

rank(A(K))=.\operatorname{rank}(A(K))=\infty.

A positive answer to the question whether every infinite field with finitely generated absolute Galois group is ample would settle this conjecture, using the infinite-rank result for non-zero abelian varieties over ample fields of characteristic zero. Its general status is open.

Sources & referencesView supporting material

Primary source

Lior Bary-Soroker and Arno Fehm, “Open Problems in the Theory of Ample Fields”, arXiv:1106.1310 (2011).

Additional references

2 papers in this index state this conjecture (2008–2011). The statement above is taken from the most recent of them; the others are arXiv:0803.1122.

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