In a recent paper by F. Gouvea and N. Yui, a detailed account is given of a patching argument due to Serre that proves that the modularity of all rigid Calabi–Yau threefolds defined over \( \mathbb{Q} \) follows from Serre’s modularity conjecture (now a theorem). In this note, we give an alternative proof of this implication. The main difference with Serre’s argument is that instead of using as a main input residual modularity in infinitely many characteristics, we just require residual modularity in a suitable characteristic. This is combined with the effective Chebotarev theorem.
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Published in Zapiski Nauchnykh Seminarov POMI, Vol. 377, 2010, pp. 44–49.
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Dieulefait, L. On the modularity of rigid Calabi−Yau threefolds: epilogue. J Math Sci 171, 725–727 (2010). https://doi.org/10.1007/s10958-010-0175-8
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DOI: https://doi.org/10.1007/s10958-010-0175-8