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Calendar of Physics Talks Vienna
| Abundant sets of internal spaces for string theory |
| Speaker: | Harald Skarke (TU Wien) |
| Abstract: | String model building usually relies on compactification on a Calabi-Yau (CY)threefold or involves a construction known as F-theory which combines the data of the internal space and of some background fields into those of a CY fourfold.The most fertile construction method for CY manifolds comes from a branch of algebraic geometry known as toric geometry,where families of CY n-folds are associated to(n+1)-
dimensional polytopes that have a certain property called reflexivity.
I will explain the concepts introduced above.Then I will outline how we managed to classify all 476,800,776 reflexive 4-polytopes almost 20 years ago,thereby creating what is still the world's largest list of CY threefolds.Finally I will report on recent work on the classification of a particular class of reflexive 5-polytopes(there are 322,383,760,930)which resulted in the largest existing database for CY fourfolds. |
| Date: | Tue, 30.04.2019 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, D. Grumiller |
| Towards Understanding Heterogeneous Catalysis: Surface Reactions on Model Nanostructured Catalysts |
| Speaker: | Swetlana Schauermann (Christian-Albrecht-University Kiel, Institute of Physical Chemistry, Kiel/Germany) |
| Abstract: | The selectivity of multi-pathway surface reactions depends on subtle differences in the activation barriers of competing reactive processes, which are difficult to control. One strategy to overcome this problem is introducing a specific, selective interaction between the reactant and the catalytically active site, directing the chemical transformations towards the desired route. This interaction can be imposed via functionalization of a solid catalyst with ligands, promoting the desired pathway via steric constrain and/or electronic effects. The microscopic-level understanding of the underlying surface processes is an important prerequisite for a rational design of this new class of ligand-functionalized catalytic materials.
In my talk, I will present two case studies. First, hydrogenation of α,β-unsaturated carbonyl compound acrolein over Pd surfaces will be discussed with a particular |
| Date: | Tue, 30.04.2019 |
| 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 |
| Quasi Transverse Momentum Distributions: Connecting Experiment and Lattice QCD |
| Speaker: | Iain Stewart (MIT) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Tue, 30.04.2019 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, S. Plätzer, M. Procura |
| Linear stability for the Kerr spacetime |
| Speaker: | Lars Andersson (AEI, Golm) |
| Abstract: | The black hole stability problem, i.e. problem of proving dynamical stability of the Kerr family of rotating black hole spacetimes, is one of the major open problems in general relativity. Linearized stability is an important step toward solving the black hole stability problem. In this talk, based on the recent paper https://arxiv.org/abs/1903.03859, joint with Bäckdahl, Blue, and Ma, I will describe our proof of linearized stability, and explain the role of the special geometry of the Kerr spacetime in the stability problem. |
| Date: | Thu, 02.05.2019 |
| 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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