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Calendar of Physics Talks Vienna
| Variable Flavor Number Scheme for Final State Jets in DIS |
| Speaker: | Daniel Samitz (Univ. Wien) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Tue, 06.10.2015 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| Black holes in the 1/D expansion |
| Speaker: | Roberto Emparan (Barcelona U.) |
| Abstract: | When the number of dimensions is very large, the gravitational field of a black hole is strongly localized near the horizon. Therefore in this limit the black hole can be effectively identified with a surface in an empty background geometry. The Einstein equations determine the effective equations that this 'black hole surface', or 'effective
membrane', must satisfy. When the black hole is static, these are the same as the equations for soap films and can be solved for non-trivial black hole geometries in a simple way. For time-evolving black branes, the effective theory gives an enormous simplification over conventional methods, allowing to easily follow the evolution of the black brane
instability to its endpoint.
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| Date: | Thu, 08.10.2015 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna) |
| Contact: | Daniel Grumiller |
| Transport in graphene nanostructrues - achievements and challenges |
| Speaker: | Prof. Dr. Thomas Ihn (Nanophysics group, ETH Zürich) |
| Abstract: | The isolation of single‐layer graphene by Geim and Novoselov in 2004 has sparked big hopes for realizing nano‐patterned coherent quantum devices with spin‐coherence times superior to the more established
semiconducting materials. In this talk I will present a selection of state‐of‐the‐art experiments with graphene quantum devices, which give insights into the achievements of the past ten years and show the challenges for future graphene nanostructures. We will discuss new experiments on a stacked van‐der Waals heterostructure device with integrated lateral confinement, which show phenomena that have been labeled "mesoscopic Coulomb drag" and exhibit "broken detailed balance". We will further see how improved material quality leads to the observation of a Lifshitz transition, and to Fabry‐Perot interference in bilayer graphene. |
| Date: | Thu, 08.10.2015 |
| Time: | 16:30 |
| Location: | Seminar room DB gelb 10 (SEM-136), Institute for Theoretical Physics – TU Wien, Wiedner Hauptstr. 8–10, 10th floor, B (yellow tower) |
| Contact: | Dr. Florian Libisch |
| Single shot simulations of dynamic quantum manybody systems |
| Speaker: | Kaspar Sakmann |
| Abstract: | Single experimental shots of ultracold quantum gases sample the many-particle
probability distribution. In a few cases single shots could be successfully simulated
from a given many-body wave function. However, for realistic time-dependent manybody
dynamics this has long been elusive. Here, we show how single shots can be
simulated from numerical solutions of the time-dependent many-body Schrödinger
equation. We provide first principle explanations for fluctuations in the collision of
attractive Bose-Einstein condensates (BECs), for the appearance of randomly
fluctuating vortices and for the center of mass fluctuations of attractive BECs in a
harmonic trap. We also show how single shot simulations provide full counting
distributions and correlation functions of any order. The described method is broadly
applicable to many-body systems whose phenomenology is driven by information
beyond what is typically available in low-order correlation functions. |
| Date: | Fri, 09.10.2015 |
| Time: | 15:30 |
| Location: | Atominstitut, Hörsaal, Stadionallee 2, Wien 2 |
| Contact: | J. Schmiedmayer |
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