Abstract
Building on work by Chabauty from 1941, Coleman proved in 1985 an explicit bound for the number of rational points of a curve \(C\) of genus \(g\ge 2\) defined over a number field \(F\), with Jacobian of rank at most \(g-1\). Namely, in the case \(F=\mathbb{Q}\), if \(p>2g\) is a prime of good reduction, then the number of rational points of \(C\) is at most the number of \(\mathbb{F}_{p}\)-points plus a contribution coming from the canonical class of \(C\). We prove a result analogous to Coleman’s bound in the case of a hyperbolic surface \(X\) over a number field, embedded in an abelian variety \(A\) of rank at most one, under suitable conditions on the reduction type at the auxiliary prime. This provides the first extension of Coleman’s explicit bound beyond the case of curves. The main innovation in our approach is a new method to study the intersection of a \(p\)-adic analytic subgroup with a subvariety of \(A\) by means of overdetermined systems of differential equations in positive characteristic.
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Acknowledgements
We would like to thank Natalia Garcia-Fritz for answering numerous questions regarding branches of curves and \(\omega \)-integrality. Initially, our results were proved for surfaces contained in abelian threefolds, and we thank Peter Sarnak for asking a question that led us to address the general case. We heartily thank the referees for carefully reading this article and for several useful comments on an earlier version of it. Specially, we thank one of the referees who found a mistake in an earlier version of Lemma 3.15.
Funding
J.C. was supported by ANID Doctorado Nacional 21190304 and H.P. was supported by ANID (ex CONICYT) FONDECYT Regular grant 1190442 from Chile.
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Caro, J., Pasten, H. A Chabauty–Coleman bound for surfaces. Invent. math. 234, 1197–1250 (2023). https://doi.org/10.1007/s00222-023-01217-1
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DOI: https://doi.org/10.1007/s00222-023-01217-1