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Calendar of Physics Talks Vienna
| CANCELLED: Stable blowup for wave maps and Yang-Mills models (Vienna Theory Lunch Seminar) |
| Speaker: | Matthias Ostermann (Universität Wien) |
| Abstract: | Unfortunately, the seminar has to be CANCELLED!
The wave maps equation first appeared in particle physics as a nonlinear sigma model and the Yang-Mills equations originated from gauge theory for the strong interaction. They constitute prototypes of nonlinear geometric wave equations which, remarkably, have an explicit solution that forms a singularity in finite time. To determine the significance of these blowup solutions for the underlying dynamics, one studies their stability. In this talk, we give an elementary introduction to the mathematical analysis of blowup in both model equations and present some new stability results.
[[part of the "Vienna Theory Lunch Seminar, see https://lunch-seminar.univie.ac.at ]] |
| Date: | Tue, 11.06.2024 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | University of Vienna, Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall |
| Contact: | Florian Lindenbauer |
| Holography of Information in a Ball of Finite Radius |
| Speaker: | Nava Gaddam (International Centre for Theoretical Sciences, Bengaluru) |
| Abstract: | The principle of Holography of Information states that all information available in the bulk of spacetime is also available near its boundary at spatial infinity. However, physical observers never have access to spatial infinity. Therefore, we ask the question: "Is information contained in a ball of finite radius also holographic in nature?". Phrased differently, we ask whether correlation functions on the boundary of the ball capture all the information of all correlators in the bulk of the ball. In this talk, I will answer this question in the affirmative, within the confines of linearised quantum gravity coupled minimally to a free Klein-Gordon field, for generic low-energy states in asymptotically flat space. Interestingly, unlike at infinity, massive and massless fields can be captured within our framework. [...] |
| Date: | Tue, 11.06.2024 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin Schrödinger-Hörsaal (Boltzmanngasse 5, 5th floor). |
| Contact: | Adrien Fiorucci, Ankit Aggarwal, Daniel Grumiller |
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