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Calendar of Physics Talks Vienna
| Quantum systems in relativistic fuzzy spaces |
| Speaker: | Peter Presnajder (Comenius University Bratislava) |
| Abstract: | We define realizations of relativistic fuzzy spaces in terms of two and four copies
of annihilation and creation operators. Operators generating (extended) relativistic
symmetry are constructed and their properties investigated. Such systems incorporate
three fundamental constants (Planck constant, velocity of light and fundamental length
or mass). We shall discuss structures emerging in such systems that seem to be
compatible with usual gravity.
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| Date: | Tue, 05.06.2018 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, D. Grumiller, H. Steinacker |
| On the cut-off dependence of the quark mass parameter in angular-ordered parton showers |
| Speaker: | Daniel Samitz (Univ. Wien) |
| Date: | Tue, 05.06.2018 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| On the unique evolution of solutions to wave equations |
| Speaker: | Jan Sbierski (Oxford) |
| Abstract: | The well-known theorem of Choquet-Bruhat and Geroch states that for given smooth initial data for the Einstein equations there exists a unique maximal globally hyperbolic development. In particular, the time-evolution of globally hyperbolic solutions is unique. This talk investigates whether the same results hold for quasilinear wave equations defined on a fixed background. We first present an example of a quasilinear wave equation for which unique evolution of smooth globally hyperbolic solutions in fact fails and contrast this case with the Einstein equations. We then proceed by presenting conditions which guarantee unique evolution. This talk is based on joint work with Felicity Eperon and Harvey Reall |
| Date: | Thu, 07.06.2018 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel, D. Fajman |
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