The DIANA seminar

This seminar is an informal forum where members of the DIANA group meet to discuss topics of interest. We meet on a weekly basis. The programme for these meetings will be advertised below, and by email.

If you wish to be added to (or removed from) our email list, please contact tobias.beran@univie.ac.at: subscribe or unsubscribe.

The the seminar takes place every Friday at 09:45 am in SE 07 and streamed via moodle and will be announced by email weekly.

Anyone interested is welcome to attend.

Summer term 2024

Date Speaker Title
08.03.Scheduling
Tue 12.03. 14:00Moriz FrauenbergerMaster defense: The Ehlers-Kundt conjecture and its failure in the impulsive case
15.03.Miguel ManzanoGeometry of abstract null hypersurfaces
AbstractIn most of the literature, hypersurfaces are considered as embedded in an ambient space. This approach, however, turns out to not be advantageous in all situations. An example of this are initial value problems in General Relativity, where one needs to prescribe some data in a hypersurface that, a priori, must be considered as not embedded in any space. In this talk I will present some results concerning non-embedded hypersurfaces. In particular, I will show that one can codify curvature information at a purely non-embedded level. I will also introduce new non-embedded notions of Killing horizons of order zero and one. These notions happen to generalize the standard concepts of non-expanding, weakly isolated and isolated horizons to general topology of the horizon and to horizons admitting fixed points. Finally, I will derive the so-called generalized master equation for general null hypersurfaces admitting a null and tangent privileged vector field.
Mon 18.03. 09:00Felix RottPhD defense: Fundamental constructions in Lorentzian length spaces
22.03.Celvin StankoFornberg–Whitham equation
AbstractThis talk will give an introduction to dispersive water waves and the phenomena of wave breaking. In particular, we are talking about the Fornberg-Whitham equation, which is also known under the name of Burgers-Poisson equation. The focus will be on developing conditions for wave breaking and presenting various solution concepts. The results are based on the paper ”Solution concepts, well-posedness, and wave breaking for the Fornberg–Whitham equation” by Günther Hörmann.
12.04.Sebastian GiegerVolume of null cones
19.04.Chiara Rigonitba
26.04.Alessio VardabassoSplitting or tba
03.05.Eduard Nigschtba
10.05.Lara LichtneckerBlowup for $L^2$-critical Schrödinger equation
17.05.Matteo CalistiNonsmooth D'Alembertian comparison
24.05.Raquel Perales?
31.05.Carl RoßdeutscherStability of Penrose
07.06.Tobias Berantba
14.06.Argam OhanyanElliptic proof of splitting
21.06.Stephan Bornbergtba
28.06.Darius ErösVariable curvature bounds