Algebra & Number Theory
- Algebra Number Theory
- Volume 10, Number 10 (2016), 2153-2234.
Canonical heights on genus-2 Jacobians
Let be a number field and let be a curve of genus with Jacobian variety . We study the canonical height . More specifically, we consider the following two problems, which are important in applications:
- for a given , compute efficiently;
- for a given bound , find all with .
We develop an algorithm running in polynomial time (and fast in practice) to deal with the first problem. Regarding the second problem, we show how one can tweak the naive height that is usually used to obtain significantly improved bounds for the difference , which allows a much faster enumeration of the desired set of points.
Our approach is to use the standard decomposition of as a sum of local “height correction functions”. We study these functions carefully, which leads to efficient ways of computing them and to essentially optimal bounds. To get our polynomial-time algorithm, we have to avoid the factorization step needed to find the finite set of places where the correction might be nonzero. The main innovation is to replace factorization into primes by factorization into coprimes.
Most of our results are valid for more general fields with a set of absolute values satisfying the product formula.
Algebra Number Theory, Volume 10, Number 10 (2016), 2153-2234.
Received: 31 March 2016
Revised: 2 August 2016
Accepted: 5 September 2016
First available in Project Euclid: 16 November 2017
Permanent link to this document
Digital Object Identifier
Mathematical Reviews number (MathSciNet)
Zentralblatt MATH identifier
Primary: 11G50: Heights [See also 14G40, 37P30]
Secondary: 11G30: Curves of arbitrary genus or genus = 1 over global fields [See also 14H25] 11G10: Abelian varieties of dimension > 1 [See also 14Kxx] 14G40: Arithmetic varieties and schemes; Arakelov theory; heights [See also 11G50, 37P30] 14Q05: Curves 14G05: Rational points
Müller, Jan; Stoll, Michael. Canonical heights on genus-2 Jacobians. Algebra Number Theory 10 (2016), no. 10, 2153--2234. doi:10.2140/ant.2016.10.2153. https://projecteuclid.org/euclid.ant/1510842635