Elliptic curves with a given number of points over finite fields

Details Elliptic curves with a given number of points over finite fields Elliptic curves with a given number of points over finite fields

2011-08-17

arxiv.org/abs/1108.3539v1

Mathematics

Number Theory

Scientific paper

Given an elliptic curve $E$ and a positive integer $N$, we consider the problem of counting the number of primes $p$ for which the reduction of $E$ modulo $p$ possesses exactly $N$ points over $\F_p$. On average (over a family of elliptic curves), we show bounds that are significantly better than what is trivially obtained by the Hasse bound. Under some additional hypotheses, including a conjecture concerning the short interval distribution of primes in arithmetic progressions, we obtain an asymptotic formula for the average.

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