Courbes de genre 3 avec S3 comme groupe d'automorphismes

Mathematics – Algebraic Geometry

Scientific paper

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15 pages; in French

Scientific paper

this paper is devoted to the study of curves of genus 3 with group of automorphisms the symmetric group S3, principally over finite fields, in view to obtain optimal curves. For instance, we prove that, over the finite fields of char. 3, for any elliptic curve E with j-invariant not in F_3, there exists a curve of genus 3 whose jacobian is isogeneous to E^3; we have also results in char. 7, and these curves provide many examples of optimal curves in any char. Nous etudions les courbes de genre 3 dont le groupe d'automorphismes est S3, en vue d'obtenir des courbes optimales sur les corps finis. En particulier, en car. 3, si E est unecourbe elliptique dont l'invariant n'est pas dans F_3, il existe une telle courbe de genre 3 dont la jacobienne est isogene a E^3; dans le cas de la caracteristique 7, des resultats plus partiels sont obtenus. Par ailleurs, ces courbes semblent donner experimentalement de nombreux cas de courbes optimales.

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