Orateur: Antonio Costa (Madrid)
Titre:
On Riemann surfaces of genus g with 4g or 4g+4 automorphisms

Résumé: We present, for all genus g>1, two 1-dimensional families of Riemann surfaces of genus g with 4g and 4g+4 automorphisms: F_{4g} and F_{4g+4} in the moduli space M_g. The set of real Riemann surfaces in F_{g} and F_{4g+4} consists of three intervals and its closure in the Deligne-Mumford compactification of M_g is a closed Jordan curve.