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Calendar of Physics Talks Vienna
| Quantum Mixtures of Atoms and Ions: Results and Perspectives |
| Speaker: | Carlo Sias (CoQuS Seminar Talk) |
| Abstract: | For further information please visit www.coqus.at |
| Date: | Mon, 13.05.2019 |
| Time: | 16:30 |
| Duration: | 120 min |
| Location: | Main Lecuture hall Atominstitut, Stadionallee 2, 1020 Vienna |
| Contact: | CoQuS Admin Team |
| Gravitational duality near cosmological space-times |
| Speaker: | Sergio Hörtner (Universidad Autónoma de Madrid) |
| Abstract: | We shall present a SO(2) duality-symmetric form of the linearized ADM action principle on anti de Sitter and Kasner backgrounds. The analysis is based on the two-potential formalism, obtained upon resolution of the Hamiltonian constraints, and generalizes previous works that focused on Minkowski and de Sitter backgrounds. |
| Date: | Tue, 14.05.2019 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, D. Grumiller |
| Structure-property Relationships in Ceria-based Model Catalysts |
| Speaker: | Josef Mysliveček (Charles University, Czech Republic) |
| Abstract: | Bottom-up fabrication of supported nanostructures represents an efficient way of preparing model catalysts with atomically defined morphology and chemical composition. The character and the surface concentration of catalytically active sites - surface point defects, line defects, metal-oxide interface,
and metal nanoparticles - can be controlled and correlated with physicochemical properties of the model catalysts.
In industrially important ceria and Pt-ceria model catalyst, a particularly rich spectrum of controlled morphological and chemical parameters allow to establish the structure-property relationships relevant for single-atom catalysis, hydrogen production, and redispersion of supported Pt nanoparticles.
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| Date: | Tue, 14.05.2019 |
| Time: | 16:00 |
| Location: | TU Wien, Institut für Angewandte Physik, E134 1040 Wien, Wiedner Hauptstraße 8-10 Yellow Tower „B“, 5th floor, SEM.R. DB gelb 05 B |
| Contact: | Univ.Prof. Dr. Ulrike Diebold |
| Probabilities and Signalling in QFT |
| Speaker: | Jeff Forshaw (Manchester) |
| Abstract: | I will talk about a way to compute transition probabilities that works directly that the level of probabilities and not amplitudes. The formalism guarantees that the initial and final states are always linked by a chain of retarded propagators and it has a nice diagrammatic approach. |
| Date: | Tue, 14.05.2019 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Kleiner Seminarraum, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, S. Plätzer, M. Procura |
| Obstructions to interacting higher-spin gauge theories in three dimensions |
| Speaker: | Stefan Fredenhagen (Univ. Wien) |
| Abstract: | as part of the joint relativity-mathematical physics seminar: Free higher-spin Fronsdal fields generalise Maxwell fields and linearised gravity to higher tensor fields. Whereas for spin-1 and spin-2 there are non-linear completions (e.g. Yang-Mills, gravity), no non-linear, gauge-invariant theory of Fronsdal fields is known. A systematic way to construct them is the Noether procedure in which a gauge invariant action is constructed in a perturbative expansion in powers of the fields.
In three space-time dimensions, there are strong obstructions to construct such an action leading to the conclusion that the interactions of the higher-spin gauge fields are completely fixed by the cubic vertices in the action.
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| Date: | Thu, 16.05.2019 |
| Time: | 13:30 |
| 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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