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Calendar of Physics Talks Vienna
| Number theoretic aspects of black hole entropy in 4d string compactification |
| Speaker: | Abhiram Kidambi (TU Wien) |
| Abstract: | In this talk, We shall look at the relation between the dyon (black hole) counting prescription in N = 4, d = 4 string theory from a macroscopic and microscopic point of view and the underlying number theoretic/algebro-geometric framework. From the macroscopic perspective for N = 4 theories, these dyonic BH degeneracies are extracted via the localization technique in N = 2 superconformal gravity while from the microscopic theory, these degeneracies are encoded in the Fourier expansion of certain automorphic forms. For the case of N = 4 in which a subset of the quarter BPS dyons are prone to wall crossing, there is a number theoretic prescription for capturing the exact dyon/BH degeneracies of those quarter BPS states that do not decay via a Jacobi-Fourier decomposition and the Hardy-Ramanujan-Rademacher circle method. However,we shall see that for an exact match of degeneracies,there ... |
| Date: | Tue, 04.12.2018 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, D. Grumiller |
| Invariants for QCD algebra |
| Speaker: | Malin Sjödahl (Univ. Lund, Schweden) |
| Abstract: | im Rahmen des Teilchenphysikseminars: Calculations involving the SU(3) structure of QCD are typically performed using so-called trace bases or color flow bases for decomposing color structure. While these spanning sets have some simplifying properties, the fact that they are overcomplete and non-orthogonal becomes a major obstacle for calculations involving many partons. In this talk I will describe how to use group invariants to perform color space calculations instead, and I will argue that this --- once a sufficient set of invariants and an efficient implementation is at hand --- may well be superior. |
| Date: | Tue, 04.12.2018 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, S. Plätzer, M. Procura |
| Extension of the J-PARC Hardron experimental facility - summary report |
| Speaker: | Prof. Hiroaki Ohnishi (Research Center for Electron Photon Science (ELPH), Tohoku University) |
| Abstract: | Dynamics of elementary particles, such as quarks and gluons, are well described by the theory of the strong interaction, i.e. Quark Chromodynamics (QCD). In our universe, many varieties of matters are created by strong interaction, e.g. proton, neutron, nucleus and even neutron stars which has supper high density matter in it. However, due to the non-perturbative nature of the QCD at low energy regime, it is very hard to construct those matters directly from QCD itself. To date, lattice QCD succeeded to construct ground state baryon masses at the point where quark mass is very close to physical point, however excited hadrons are not. Thus Hadron spectroscopy and investigation of hadron-hadron interaction will be a way to reveal the information of nature in low energy QCD. One of the keys... [full abstract available here: https://indico.smi.oeaw.ac.at/event/304/] |
| Date: | Wed, 05.12.2018 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Stefan-Meyer-Institut, Boltzmanngasse 3, 1090 Wien, Seminarraum 3-2-08 (2. Stock) |
| Contact: | Prof. Dr. Eberhard Widmann, Dr. Martin Simon |
| Optimal transport and the Einstein equations |
| Speaker: | Stefan Suhr (Ruhr-Uni Bochum) |
| Abstract: | Im Rahmen des Literaturseminars für Gravitationsphysik: The Ricci curvature is the basic ingredient in the Einstein equations of general relativity.
In recent years the interpretation of Ricci curvature in Riemannian geometry has changed fundamentally via its characterization in terms of convexity properties of e.g. the Shannon-Bolzmann entropy of optimal transportation. In my talk I will explain the recent development of an analogous characterization of Ricci curvature in Lorentzian geometry.
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| Date: | Thu, 06.12.2018 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel, D. Fajman |
| Erwin Schrödinger Lecture: Dynamic Graph Algorithms: A Survey |
| Speaker: | Monika Henzinger (University of Vienna) |
| Abstract: | Real-world graphs are huge and many of them change dynamically. Thus to compute properties of these graphs we need dynamic graph algorithms that efficiently maintain properties of dynamically changing graphs. We present the state-of-the-art in dynamic graph algorithms and explain some of the techniques that they use as well as recent progress in giving lower bounds for their running time.
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| Date: | Thu, 06.12.2018 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | ESI, Boltzmanngasse 9, 1090 Wien, Top Floor, Boltzmann Lecture Hall |
| Contact: | ESI, secr@esi.ac.at |
| Unravelling the mystery of dark matter in the light of experimental results |
| Speaker: | Suchita Kulkarni (HEPHY Wien) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Fri, 07.12.2018 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, S. Plätzer |
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