[K-OS] Knot Online Seminar
[K-OS] is an online research seminar which focuses on knot
theory and low-dimensional topology. Talks will be delivered
by authors of recent arXiv articles of significant interest.
It happens the 3rd Thursday of every month
from 16:15 to 17:15
(
CET/CEST Berlin,
Brussels, Madrid, Paris, Rome, Vienna, Warsaw, Zurich)
on
Zoom.
It is organized by
Marc
Kegel,
Alexandra
Kjuchukova,
Lukas
Lewark,
Delphine
Moussard
and
Anne-Laure
Thiel.
It benefits from logistical support from
the
CNRS and
ETHZ.
If there is a recent arXiv preprint which you would like to see featured on the seminar, please email the organizers with your suggestion.
The K-OS talks are also listed in a
Google Calendar.
Forthcoming Talks
July and August 2026
15 October 2026
- Speaker: Daniel Kasprowski (University of Southampton)
- Stably exotic fillings of 3-manifolds (arXiv:2608.23523)
- Abstract: Stably exotic fillings of a 3-manifold Y are 4-manifolds bounding Y that are homeomorphic but not stably diffeomorphic rel. Y. We show that every closed, orientable 3-manifold admits such fillings, as do certain families of nonorientable 3-manifolds. In contrast we show that for a 3-manifold containing a 2-sided RP2, any two smooth, homeomorphic fillings are stably diffeomorphic. This is joint work with Patrick Orson, Mark Powell, and Arunima Ray.
