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Computing functions on Jacobians and their quotients

Part of: Abelian varieties and schemes Computational aspects in algebraic geometry

Published online by Cambridge University Press:  01 August 2015

Jean-Marc Couveignes  and
Tony Ezome
Jean-Marc Couveignes
Affiliation:
Univ. Bordeaux, Bordeaux INP, CNRS, IMB, UMR 5251, F-33400 Talence, France INRIA, LFANT, LIRIMA, F-33400 Talence, France email Jean-Marc.Couveignes@u-bordeaux.fr
Tony Ezome
Affiliation:
Université des Sciences et Techniques de Masuku, Faculté des Sciences, Département de mathématiques et informatique, BP 943 Franceville, Gabon INRIA, LIRIMA, F-33400 Talence, France email latonyo2000@yahoo.fr

Abstract

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We show how to efficiently evaluate functions on Jacobian varieties and their quotients. We deduce an algorithm to compute $(l,l)$ isogenies between Jacobians of genus two curves in quasi-linear time in the degree $l^{2}$ .

MSC classification

Primary: 14K02: Isogeny 14Q05: Curves 14Q20: Effectivity, complexity
Secondary: 14K25: Theta functions

Information

Type
Research Article
Information
LMS Journal of Computation and Mathematics , Volume 18 , Issue 1 , 2015 , pp. 555 - 577
Copyright
© The Author(s) 2015 

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