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Séminaire de Théorie des Nombres

On the Lang Trotter conjecture

Antonella Perucca

( (Université de Luxembourg) )

Salle de conférences

le 31 janvier 2025 à 14:00

The Lang-Trotter Conjecture on primitive points is the analogue for elliptic curves of Artin's conjecture on primitive roots. Indeed, if we have an elliptic curve EE over Q\mathbb Q with a rational point PP of infinite order, we may count the primes pp of good reduction for which (Pmodp)(P \bmod p) generates E(Fp)E(\mathbb F_p). We formulate and investigate some natural variants of the Lang-Trotter Conjecture. For example, we require that the order of the point (Pmodp)(P \bmod p) equals the exponent of the group E(Fp)E(\mathbb F_p): this means that the subgroup generated by the point is as large as possible, and the condition is meaningful also for non-cyclic groups. This is joint work with Alexandre Benoist.