Torsion for CM elliptic curves defined over number fields of degree 2𝑝

Abstract

For a prime number p p , we characterize the groups that may arise as torsion subgroups of an elliptic curve with complex multiplication defined over a number field of degree 2 p 2p . In particular, our work shows that a classification in the strongest sense is tied to determining whether there exist infinitely many Sophie Germain primes.