Naslov
Ranks of elliptic curves with prescribed torsion over number fields

Autori
Bosman, Johan ; Bruin, Peter ; Dujella, Andrej ; Najman, Filip

Izvornik
International mathematics research notices (1073-7928) (2014), 11; 2885-2923

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
elliptic curves; number elds; rank; torsion group

Sažetak
We study the structure of the Mordell-Weil group of elliptic curves over number fields of degree 2, 3, and 4. We show that if T is a group, then either the class of all elliptic curves over quadratic fields with torsion subgroup T is empty, or it contains curves of rank 0 as well as curves of positive rank. We prove a similar but slightly weaker result for cubic and quartic fields. On the other hand, we find a group T and a quartic field K such that among the elliptic curves over K with torsion subgroup T, there are curves of positive rank, but none of rank 0. We find examples of elliptic curves with positive rank and given torsion in many previously unknown cases. We also prove that all elliptic curves over quadratic fields with a point of order 13 or 18 and all elliptic curves over quartic fields with a point of order 22 are isogenous to one of their Galois conjugates and, by a phenomenon that we call false complex multiplication, have even rank. Finally, we discuss connections with elliptic curves over finite fields and applications to integer factorization.

Izvorni jezik
Engleski

Znanstvena područja
Matematika

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