LdT Seminar - Thursday 28/11/2024 (Room 136)

[Rafael Torres]

Speaker: Alessio Di Prisa (Scuola Normale Superiore di Pisa)

Title: On rational sliceness of negative amphichiral links

Abstract: We say that a link L in S3 is negative amphichiral if there exists an orientation-reversing diffeomorphism of S3 that sends every component of L to itself with the opposite orientation. If such a map can be chosen to be an involution, then the link is said to be strongly negative amphichiral. Kawauchi proved that every strongly negative amphichiral link is rationally slice, i.e. it bounds a disjoint collection of disks in a rational homology 4-ball. In this talk, we prove that every negative amphichiral link is rationally slice, extending the aforementioned work of Kawauchi. Our proof relies on a careful analysis of the JSJ decomposition of the link complement of negative amphichiral links. This is joint work in progress with Jaewon Lee (KAIST, Daejeon) and Oğuz Şavk (CNRS, Nantes).

Date: Thursday November 28th, 2024
Time: 11:00 am
Venue: Room 136