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Calendar of Physics Talks Vienna
| Strings, Branes, Schwarzian action and Maximal Chaos |
| Speaker: | Avik Banerjee (Saha Institut of Nuclear Physics, India) |
| Abstract: | Large N CFTs with Einstein gravity dual are known to saturate the chaos bound, i.e, λ=2π/(β). In my talk I shall discuss how maximal chaos occurs for a generic, probe quark-like defect degrees of freedom, for both scalar and vector operators, in a strongly coupled large N_C gauge theory. In holography, this corresponds to the dynamics of open string degrees of freedom, in the background of a closed string geometric background. The corresponding maximal chaos is governed by an intrinsic defect D-brane horizon. In this context, I shall show that a Schwarzian effective action emerges, in the infra-red, from an open string worldsheet, as well as a D1-brane worldvolume, embedded in AdS. I shall further elaborate on the connection between the emergence of Schwarzian effective action and the chaos bound saturation, which also happens to be the story for Jackiw- Teitelboim theory. |
| Date: | Tue, 09.10.2018 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, D. Grumiller |
| Novel analysis and simulation tools for super-resolution microscopy |
| Speaker: | Dipl.-Ing. Benedikt Rossboth (TU Wien, Institut für Angewandte Physik) |
| Abstract: | The advent of single-molecule localization microscopy methods gave rise to the concept of membrane protein clustering at the nano-scale with cluster radii of 20-100 nm. Recently, our group developed an alternative approach to investigate this topic, termed label-titration microscopy. We applied this method to re-investigate the spatial distribution of several plasma membrane proteins and included novel data analysis and simulation tools.
Additionally, we also performed STED microscopy, a conceptually different super-resolution microscopy method. We found that the T cell receptor, a central receptor within the immune system, is distributed randomly on the membrane of non-activated T cells.
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| Date: | Tue, 09.10.2018 |
| Time: | 16:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Sem.R. DB gelb 05 B (room number DB05L03), 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Univ.Prof. Dr. Gerhard Schütz |
| Overcoming blinking artifacts in nanocluster detection with two-color STORM |
| Speaker: | Dipl.-Ing. Andreas Arnold (TU Wien, Institut für Angewandte Physik) |
| Abstract: | Concerns about the existence of nanoclusters have been fueled by the notion that virtually all fluorescent probes show complex blinking behavior including long-lived dark states. This results in artificial localization clusters due to the repeated observation of single molecules. Here, we present a new approach to detect real molecular clustering using information from two-color STORM experiments. Molecular clusters exhibit a characteristic bias towards short nearest neighbor distances between localizations of different color. Shifts of one color channel provides intrinsic controls, thus allowing for statistical significance tests without the necessity of additional calibration. |
| Date: | Tue, 09.10.2018 |
| Time: | 16:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Sem.R. DB gelb 05 B (room number DB05L03), 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Univ.Prof. Dr. Gerhard Schütz |
| Imaging Fundamental Processes: The story and stories of jets at accelerators |
| Speaker: | George F. Sterman (SUNY, Stony Brook) |
| Abstract: | 2. Vorlesung im Rahmen der Schrödinger Gastprofessur 2018:
Jets at particle colliders are our window into fundamental reactions, which often proceed through confined degrees of freedom that are invisible at long distances. I’ll review some of the history and theory of particle jets, and how they reflect a crossroads between classical and quantum phenomena. |
| Date: | Tue, 09.10.2018 |
| Time: | 16:15 |
| Duration: | 90 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
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