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Calendar of Physics Talks Vienna
| Proton lifetime in minimal gauge unifications |
| Speaker: | Michal Malinsky (Charles University, Prague) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Tue, 01.12.2015 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | W. Grimusl, H. Neufeld |
| The many faces of the constraints in general relativity |
| Speaker: | Istvan Racz (Budapest) |
| Abstract: | In this talk the constraint equations for smooth spaces satisfying Einstein's equations will be considered. It is shown that, regardless whether the primary space is Riemannian or Lorentzian, the constraints can always be put into the form of an evolutionary system comprised either by a first order symmetric hyperbolic system and a parabolic equation or, alternatively, by a symmetrizable hyperbolic system subsided by an algebraic relation. The (local) existence and uniqueness of solutions to these evolutionary systems is also shown verifying thereby that the proposed evolutionary approach provides a viable alternative to the apparently unique conformal method. |
| Date: | Thu, 03.12.2015 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum, 5. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| Holography of hairy black holes |
| Speaker: | Dumitru Astefanesei (Pontificia Universidad Catolica de Valparaıso, Chile) |
| Date: | Thu, 03.12.2015 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Institute for Theoretical Physics, TU Wien, Seminar room 10th floor, Wiedner Hauptstr.8-10 |
| Contact: | Johanna Knapp, Anton Rebhan |
| Low-Lying Excitations in the Orbitally Active A-Site Spinels FeSc2S4 , FeCr2O4 and FeCr2S4 |
| Speaker: | Joachim Deisenhofer (Institute of Physics, University of Augsburg, Germany) |
| Abstract: | The spinel systems FeSc2S4, FeCr2O4, and FeCr2S4 show cubic symmetry at room temperature, but they reveal very different magnetic ground states at low temperatures. FeSc2S4 does not reveal any structural transition below room temperature, but forms a spin-orbital liquid state at lowest temperatures. In FeCr2S4 a long-range ferromagnetic order is followed by an incommensurate magnetic structure. Finally, a multiferroic state with orbital order is reached. Similar magnetic structures occur in FeCr2O4, but a tetragonal distortion precedes magnetic ordering and indicates a stronger Jahn-Teller coupling than in FeCr2S4. These different states are tracked and discussed via optical excitations using THz- and FIR-spectroscopy. |
| Date: | Fri, 04.12.2015 |
| Time: | 14:00 |
| Duration: | 45 min |
| Location: | Seminar Room CBEG02 (387, Photonics); Gußhausstraße 27 |
| Contact: | Andrei Pimenov |
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