A refinement of Koblitz's conjecture
Number Theory
2009-09-30 v1
Abstract
Let E be an elliptic curve over the number field Q. In 1988, Koblitz conjectured an asymptotic for the number of primes p for which the cardinality of the group of F_p-points of E is prime. However, the constant occurring in his asymptotic does not take into account that the distributions of the |E(F_p)| need not be independent modulo distinct primes. We shall describe a corrected constant. We also take the opportunity to extend the scope of the original conjecture to ask how often |E(F_p)|/t is prime for a fixed positive integer t, and to consider elliptic curves over arbitrary number fields. Several worked out examples are provided to supply numerical evidence for the new conjecture.
Cite
@article{arxiv.0909.5280,
title = {A refinement of Koblitz's conjecture},
author = {David Zywina},
journal= {arXiv preprint arXiv:0909.5280},
year = {2009}
}