Harvard–MIT Algebraic Geometry Seminar
Tue Apr 9, 2024 3:00–4:00 PM
Location
Off-campus, 507
Description
Speaker: Louis Esser (Princeton)Title: The Dual Complex of a G-varietyAbstract: We introduce a new invariant of G-varieties, the dual complex, which roughly measures how divisors in the complement of the free locus intersect. We show that the top homology group of this complex is an equivariant birational invariant of G-varieties. As an application, we demonstrate the non-linearizability of certain large abelian group actions on smooth hypersurfaces in projective space of any dimension and degree at least 3.
- Harvard–MIT Algebraic Geometry SeminarSpeaker: Louis Esser (Princeton)Title: The Dual Complex of a G-varietyAbstract: We introduce a new invariant of G-varieties, the dual complex, which roughly measures how divisors in the complement of the free locus intersect. We show that the top homology group of this complex is an equivariant birational invariant of G-varieties. As an application, we demonstrate the non-linearizability of certain large abelian group actions on smooth hypersurfaces in projective space of any dimension and degree at least 3.