Abstract
We discuss some aspects of the behavior of specialization at a finite place of Néron–Severi groups of K3 surfaces over number fields. We give optimal lower bounds for the Picard number of such specializations, thus answering a question of Elsenhans and Jahnel. As a consequence of these results, we show that it is possible to compute explicitly the Picard number of any given K3 surface over a number field.
Citation
François Charles. "On the Picard number of K3 surfaces over number fields." Algebra Number Theory 8 (1) 1 - 17, 2014. https://doi.org/10.2140/ant.2014.8.1
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