Exceptional jumps of Picard ranks of reductions of K3 surfaces over number fields
Exceptional jumps of Picard ranks of reductions of K3 surfaces over number fields
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K3 曲面在数域上的约简皮卡德等级的异常跳跃
DOI:
10.1017/fmp.2022.14
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Tayou, Salim
中科院分区:
文献类型:
--
作者:
Shankar, Ananth N.;Shankar, Arul;Tang, Yunqing;Tayou, Salim
Given a K3 surface X over a number field K with potentially good reduction everywhere, we prove that the set of primes of K where the geometric Picard rank jumps is infinite. As a corollary, we prove that either has infinitely many rational curves or X has infinitely many unirational specialisations.Our result on Picard ranks is a special case of more general results on exceptional classes for K3 type motives associated to GSpin Shimura varieties. These general results have several other applications. For instance, we prove that an abelian surface over a number field K with potentially good reduction everywhere is isogenous to a product of elliptic curves modulo infinitely many primes of K.
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