Campana's Orbifold Mordell conjecture

Let (X,Δ)(X,\Delta) be a C-pair over a number field KK, where XX is a smooth proper curve of genus gg. Here Δ\Delta is the orbifold boundary divisor of the C-pair, and potential density of integral points is defined using integral points of a suitable model after finite extension of KK.

Orbifold Mordell conjecture. Assume that

2g2+degΔ>0.2g-2 +\deg \Delta >0.

Then the C-pair (X,Δ)(X,\Delta) does not satisfy potential density of integral points.

This is the orbifold analogue of Mordell's finiteness theorem for curves of general type. The source gives no resolution of the conjecture.

Sources & referencesView supporting material

Primary source

Finn Bartsch and Ariyan Javanpeykar, “Weakly special varieties, Campana stacks, and Remarks on Orbifold Mordell”, arXiv:2603.28745 (2026).

Additional references

11 papers in this index state this conjecture (2004–2026). The statement above is taken from the most recent of them; the others are arXiv:2511.22545, arXiv:2401.13186, arXiv:2207.05412, arXiv:2203.03273, arXiv:1409.6706, arXiv:1210.0421, arXiv:1008.4850, arXiv:0903.0560, arXiv:math/0701105, arXiv:math/0405093.

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