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Angela Ortega: Generically finite Prym maps

Tid: Ti 2021-09-07 kl 13.15 - 14.15

Plats: Institut Mittag-Leffler, Seminar Hall Kuskvillan (alt. Zoom, meeting ID: 921 756 1880)

Medverkande: Angela Ortega (Humboldt-Universität zu Berlin)

Abstract: Given a finite morphism between smooth projective curves one can canonically associate to it a polarised abelian variety, the Prym variety. This induces a map from the moduli space of coverings to the moduli space of polarised abelian varieties, known as the Prym map. It is a classical result that the Prym map is generically injective for étale double coverings over curves of genus at least 7.

In this talk I will show the global injectivity of the Prym map for ramified double coverings over curves of genus g ≥ 1 and ramified in at least 6 points. This is a joint work with J.C. Naranjo.

I will finish with an overview on what is known for the degree of the Prym map for ramified cyclic coverings of degree d ≥ 2.