Green–Griffiths–Lang conjecture for Mordellic varieties

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Let kk be a number field and let kalgk^{\mathrm{alg}} be an algebraic closure of kk. Let XX be a smooth projective geometrically irreducible variety over kk. The properties of XX being Mordellic, every rational map from every abelian variety over kalgk^{\mathrm{alg}} to XkalgX_{k^{\mathrm{alg}}} being constant, and every complex analytification XσanX_\sigma^{\mathrm{an}} being Brody hyperbolic are the conditions in question. Green–Griffiths–Lang conjecture. The following are equivalent:

X is Mordellic;for every abelian variety A over kalg, all rational maps f:A⇢Xkalg are constant;for every embedding σ:k→C, Xσan is Brody hyperbolic, i.e. every holomorphic map f:C→Xσan is constant.\begin{aligned} &X\text{ is Mordellic};\\ &\text{for every abelian variety }A\text{ over }k^{\mathrm{alg}},\text{ all rational maps }f:A\dashrightarrow X_{k^{\mathrm{alg}}}\text{ are constant};\\ &\text{for every embedding }\sigma:k\to\mathbb{C},\ X_\sigma^{\mathrm{an}}\text{ is Brody hyperbolic,}\text{ i.e. every holomorphic map }f:\mathbb{C}\to X_\sigma^{\mathrm{an}}\text{ is constant.} \end{aligned}

This conjecture seeks equivalent arithmetic, algebraic, and complex-analytic characterizations of varieties with finite rational-point sets over every finite extension. Its general status is open.

References

Primary source

Natalia Garcia-Fritz and Hector Pasten, “Xeric varieties”, arXiv:2508.05560 (2025).

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