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Calendar of Physics Talks Vienna
| A look at the physics and chemistry of complex surfaces |
| Speaker: | Prof. Dr. Hans-Peter Steinrück (Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg/D) |
| Abstract: | Surface reactions can be followed in detail using X-ray photoelectron spectros¬copy (XPS or ESCA). From the binding energies of the adsorbate and sub¬strate core levels, detailed information on the chemical composition, chemical state (e.g. oxidation state), adsorption sites, but also on the photoemission process itself can be derived. Different examples will be addressed in this presentation. The first example deals with the oxidation of sulphur on stepped platinum surfaces. The second example deals with the characterization and modification of the surface properties of ionic liquids (ILs). Due to their low vapor pressure, the full arsenal of UHV-based surface scien¬ce methods can be applied to investigate this material class and detai¬led information can be derived. Particular emphasis will be given on the composition of the IL/vacuum interface, the properties of ultrathin IL layers on |
| Date: | Tue, 20.05.2014 |
| Time: | 16:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134A, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Univ.Prof. Dr. Ulrike Diebold |
| SU(2) Quantum Yang-Mills theory and the CMB large-angle anomalies |
| Speaker: | Ralph Hoffmann (Univ. Heidelberg) |
| Abstract: | Im Rahmen des Teilchenphysikseminars |
| Date: | Tue, 20.05.2014 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, V. Mateu |
| Isolated self--gravitating bodies |
| Speaker: | Bernd Schmidt (AEI Potsdam) |
| Abstract: | im Rahmen des Literaturseminars für Gravitationsphysik |
| Date: | Thu, 22.05.2014 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| Black holes, entanglement & random matrices |
| Speaker: | Joan Simon (University of Edinburgh) |
| Abstract: | Quantum entanglement and typicality play a crucial role to understand the foundations of statistical mechanics. Recently, it has been suggested than the former is also relevant to explain the connectedness of spacetime. In particular, a direct relation between semiclassical wormholes and quantum entanglement has been conjectured. In this talk, I will first discuss some necessary, but not sufficient, conditions that correlation functions of low energy gravity probe operators must satisfy to allow an interpretation in terms of a semiclassical wormhole. I will then study typicality of these correlators in the space of quantum states having the same amount of entanglement. To compute these correlators I will argue that low energy gravity probe operators behave like random matrices when acting on the space of black hole microstates. I will conclude that typical entangled states do not allow a semiclassical wormhole interpretation.
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| Date: | Thu, 22.05.2014 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | SEM 136 (Freihaus, Wiedner Hauptstrasse 8-10), Institute for Theoretical Physics, Vienna University of Technology |
| Contact: | Daniel Grumiller and Johanna Knapp |
| Speaker: | Timm Wrase (Stanford U.) |
| Abstract: | I give a brief introduction to string cosmology. Then I review the results of the BICEP2 experiment that recently
discovered B-mode polarization. Interpreting these B-modes as primordial gravitational waves gives strong evidence for
cosmic inflation at roughly the GUT scale. This discovery is not only a smoking gun for inflation but also provides us
with access to physics near the GUT scale. I describe new ways of obtaining inflation in string theory that lead to
predictions that match the new measurements by BICEP2. Lastly, I mention some on-going work on constructing new large
classes of dS vacua in supergravity and string theory. |
| Date: | Fri, 23.05.2014 |
| Time: | 14:00 |
| Location: | Inst. f. Theoret. Physik, TU Wien, SEM136, 10.OG, Wiedner Hauptstr. 8-10 |
| Contact: | Anton Rebhan |
| Phase Transitions in Telechelic Star Polymers |
| Speaker: | Maud Formanek (Univ. Wien) |
| Abstract: | im Rahmen der gemeinsam veranstalteten Seminare
„Komplexe Stochastische Systeme“ (Univ. Wien) und
„Analyse Komplexer Systeme“ (Med. Univ. Wien) |
| Date: | Fri, 23.05.2014 |
| Time: | 14:15 |
| Duration: | 90 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | H. Hüffel und Stefan Thurner |
| Jet quenching enhancement around phase transition from dynamical holographic QCD model |
| Speaker: | Prof. Mei Huang (Institute of High Energy Physics, Chinese Academy of Sciences, Beijing) |
| Abstract: | The phase transition and jet quenching parameter have been investigated in the framework
of dynamical holographic QCD model. It is found that both the trace anomaly and the ratio
of the jet quenching parameter over cubic temperature show a peak around the critical temperature,
and the ratio of jet quenching parameter over entropy density sharply rises at Tc.
This indicates that the jet quenching parameter can characterize the phase transition. The effect
of jet quenching parameter enhancement around phase transition on nuclear modification factor and
elliptic flow have also been analyzed, and it is found that the temperature dependent jet quenching
parameter from dynamical holographic QCD model can considerably improve the description of jet
quenching azimuthal anisotropy as compared with the conformal case. |
| Date: | Sun, 25.05.2014 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | TU Wien, Seminar Room 136 (10th floor, yellow section) |
| Contact: | Andreas Schmitt |
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