Department of Mathematics

Seminar / Workshop

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Smooth Fano varieties with torus action of Hirzebruch type

10 September 2025, start time 14:00 - 15:00
Ferrari 1 Building, Via Sommarive 5, Povo (Trento)
Room A219
Free
Organizer: Department of Mathematics
Target audience: University community
Referent: R. Pignatelli, E. Postinghel, L. Solá Conde
Contacts: 
Staff of the Department of Mathematics
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Speaker: Milena Wrobel (University Magdeburg)

We study smooth Fano varieties with torus action by using their description via a specific rational quotient, the so called maximal orbit quotient (MOQ). In the case of torus actions of complexity one, the MOQ turns out to be a projective line, having points as its critical configuration. In this talk we focus on torus actions of complexity two, which turns the MOQ into a surface allowing a bunch of possible quotients. We shortly recall the case where the MOQ is a projective plane with a hyperplane arrangement as its critical configuration. Then, going one step further, we replace the projective plane with a Hirzebruch surface and give first classification results in this setting.