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Calendar of Physics Talks Vienna
| Spontaneous symmetry breaking and Nambu-Goldstone bosons: some news in the old story |
| Speaker: | Tomas Brauner (University of Helsinki) |
| Abstract: | The concept of spontaneous symmetry breaking is key to understanding of a vast range of physical phenomena such as superfluidity, ferromagnetism, or the origin of masses of elementary particles. I will provide a brief introduction to this classic topic and then review some recent results: (i) Completed classification and counting of Nambu-Goldstone bosons; (ii) A new class of states protected by symmetry: the massive Nambu-Goldstone bosons. I will conclude by outlining some yet unresolved problems, relevant for applications to a variety of quantum many-body systems. |
| Date: | Mon, 02.12.2013 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Vienna University of Technology, Wiedner Hauptstr. 8-10, yellow area, 10th floor, seminar room E136 |
| Contact: | Andreas Schmitt |
| Monte Carlo Simulations in Statistical Physics: Theory and Applications |
| Speaker: | Christian Leitold (University of Vienna) |
| Abstract: | In statistical mechanics, many quantities of interest, like a system's energy as a function of temperature, are given as a high dimensional integral in the configuration space of the system which cannot be evaluated directly. However, it is possible to approximate this integral by a sequence of random samples, distributed according to the underlying probability distribution, e. g. the Boltzmann distribution in the case of a system with fixed temperature, volume and particle number. One way to generate such a sequence is the Metropolis algorithm. In my talk, I will present the theoretical background of this algorithm and give a few examples of its applications in the field of soft and condensed matter simulations. This applications range from comparatively easy systems like the Lennard-Jones fluid to more complex cases like the sampling of typical folding pathways in a model protein. |
| Date: | Tue, 03.12.2013 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | Univ. of Vienna, Faculty of Physics, Boltzmanngasse 5, 5th floor, Erwin Schrödinger Lecture Hall |
| Contact: | Albert Georg Passegger, Peter Poier - www.univie.ac.at/lunch-seminar |
| P and T violation in heavy atoms |
| Speaker: | Lorenz Willmann (University of Groningen, The Netherlands) |
| Abstract: | Searches for violations of the fundamental discrete symmetries parity (P), time reversal (T) and charge conjugation (C) provide guidelines for model building beyond the Standard Model of the electroweak interactions (SM). Here, experiments are performed on many different energy scales. At low energies searches for permanent electric dipole moments (EDMs) have a robust discovery potential while measurements of atomic parity violation (APV) test the electroweak interactions.
These effects are strongly enhanced in heavy atomic systems and they become accessible in precision atomic physics experiment. The sensitivity of neutral radium towards EDMs arises from its nuclear and atomic structure which result radium offers the largest known atomic enhancement factors to nuclear and electron EDMs.
Furthermore atomic parity violation can be measured in a single trapped radium ion. The precision de |
| Date: | Wed, 04.12.2013 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Stefan-Meyer-Institut, ÖAW, Seminar room, Boltzmanngasse 3, Room 2.08 |
| Contact: | Ken Suzuki |
| Relativistic motion and self-interaction |
| Speaker: | Abraham Harte (AEI Potsdam) |
| Abstract: | im Rahmen des Literaturseminars für Gravitation |
| Date: | Thu, 05.12.2013 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock |
| Contact: | H. Rumpf |
| Maksimovic - The story of Bruno Pontecorvo |
| Speaker: | Filmvorführung - Idee und Drehbuch: G. Mussardo (SISSA) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Thu, 05.12.2013 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | W. Grimus, H. Neufeld |
| Critical Collapse in the Axion-Dilaton system in type IIB and in diverse dimensions |
| Speaker: | Ehsan Hatefi (ICTP Trieste) |
| Abstract: | The talk is based on two different parts. First, based on arxiv:1108.0078 (Class. Quantum Grav. 29 (2012) 025006) we study the gravitational collapse of the axion-dilaton system suggested by type IIB string theory in dimensions ranging from four to ten. We extend previous analysis concerning the role played by the global SL(2,R) symmetry and we evaluate the Choptuik exponents in the elliptic case. In the second part of the talk (based on arxiv:1307.1378, JCAP 1310 (2013) 037), we complete our previous study of critical gravitational collapse in the axion-dilaton system by analysing the hyperbolic and parabolic ansätze. We also introduce a new method to obtain perturbations and how to explore the corresponding Choptuik exponents in four-dimensions which differs from the elliptic case.
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| Date: | Thu, 05.12.2013 |
| 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 |
| Mathematical formulation of multi-layer networks |
| Speaker: | Anna Chmiel (Med.Univ.Wien) |
| Abstract: | im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische
Systeme" (Univ.Wien) und "Analyse Komplexer Systeme" (Med.Univ.Wien) |
| Date: | Fri, 06.12.2013 |
| Time: | 14:15 |
| Duration: | 90 min |
| Location: | Medizinische Universität Wien, Informatikbibliothek, Bauteil 88, E03, Spitalgasse 23, 1090 Wien |
| Contact: | H. Hüffel, Stefan Thurner |
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