Calendar of Physics Talks Vienna

Amplitude and phase modulation in pulsating stars
Speaker:Katrien Kolenberg (Uni Wien)
Abstract:Lunch Club Overview
Date: Tue, 22.06.2010
Time: 12:30
Duration: 60 min
Location:University of Vienna, Boltzmanngasse 5, 5th Floor, Large Seminar Room
Contact:Theo Adaktylos, David Burke, Andreas Gabriel, Niklas Johansson & Christoph Spengler

The Wonderful World of DECOHERENCE
Speaker:Philip Stamp (Pacific Institute of Theoretical Physics, UBC, Vancouver, Canada)
Abstract:Decoherence is widely advocated as a panacea to explain how complex quantum systems behave classically. Viewed as a physical process, decoherence is widely recognised to be the single biggest obstacle to quantum computing. It is also discussed in contexts as varied as the early universe, mesoscopics and nanoscience, biophysical systems, and large‐scale quantum phenomena in condensed matter and optical systems. But how does decoherence, and what are the mechanisms causing it? And is decoherence really “the answer to all our problems”? I will argue that the last few years have seen a very deep advance in our understanding of decoherence. Only very recently has any kind of quantitative agreement been reached between predictive theory and real experiments for complex quantum systems, in investigations of decoherence on large multi‐spin magnetic molecules. These experiments test at least 3 different decoherence mechanisms simultaneously, involving both ‘spin bath’ and ‘oscillator bath’ environmental decoherence. Theory also predicts new decoherence mechanisms which have not yet been investigated, such as ‘3rd‐party decoherence’; and exciting new frontiers are opening in this field, including ideas about the role of decoherence in some biological processes. Behind all of these developments is the suspicion that there may even be ‘intrinsic decoherence’ processes in Nature, which can never be suppressed. This talk will introduce a general audience to this topic, focusing on the recent progress (theoretical and experimental), and on some of the outstanding questions.
Date: Tue, 22.06.2010
Time: 14:00
Location:Fakultät für Physik, Christian-Doppler-Hörsaal, Boltzmanngasse 5, 1090 Wien
Contact:Elke Kreiseder

The Hawking-effect and some of its Consequenses
Speaker:Albert Huber (Wien) (Fakultät für Physik)
Abstract:im Rahmen des Seminars für Mathematische Physik
Date: Tue, 22.06.2010
Time: 14:15
Duration: 60 min
Location:Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:J. Yngvason

Examples of Finsler metrics: The Funk weak metric and the Hilbert metric on convex sets
Speaker:Prof. Athanase Papadopoulos (IRMA Strasbourg)
Date: Tue, 22.06.2010
Time: 16:00
Location:ESI Schrödinger Lecture Hall

Imaging HIV Transfer between T Cells with Optical Superresolution
Speaker:Berufungsvortrag Biophysik: Thomas Huser (NSF Center for Biophotonics Science and Technology, and Department of Internal Medicine, University of California, Sacramento, Kalifornien/USA)
Abstract:Live cell imaging with molecularly specific contrast is a particular strength of optical microscopy, permitting the dynamic observation of events at the single cell level within a cell or interactions between cells. This provides highly quantitative biophysical data e.g. to unravel the systems biology of HIV transfer between cells. Most live cell imaging experiments make use of the high specificity provided by labeling cellular components with fluorescent dyes and fluorescent proteins. Here, I will present our latest data on tracking HIV-1 transfer between cells by conducting 4D live cell fluorescence microscopy with a replication-competent clone of the virus. I will also discuss how extensions of fluorescence microscopy, in particular 3D structured illumination super-resolution microscopy allow us to further dissect the structure of adhesive synapses between cells that form during cell-cell virus transfer. I will also touch upon how label-free optical microscopy methods, in particular doubly-resonant coherent anti-Stokes Raman scattering (DR-CARS) microscopy will soon allow us to overcome the short time window set by fluorescence photobleaching and follow such and similar processes for unrestricted periods of time.
Date: Tue, 22.06.2010
Time: 16:30
Duration: 60 min
Location:Technische Universität Wien, Freihaus Hörsaal 6, Turm A (grüne Leitfarbe), 2. OG, 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Ao.Univ.Prof. Dr. Herbert Störi

Information Complementary Relation in Quantum Mechanics
Speaker:Caslav Brukner (Univ.Wien) (Fakultät für Physik und Medizinische Univ.Wien))
Abstract:Lecture Series: Contemporary Views on Entropy in Classical, Quantum and Complex Systems
Date: Wed, 23.06.2010
Time: 16:00
Duration: 90 min
Location:Josef Stefan-Hörsaal, Boltzmanngasse 5, 3. Stock
Contact:Helmuth Hüffel und Stefan Thurner

The Entropy of Complex Systems and their Distribution Functions
Speaker:Stefan Thurner (Medizinische Univ.Wien) (Fakultät für Physik und Med.Univ.Wien)
Abstract:Lecture Series: Contemporary Views on Entropy in Classical, Quantum and Complex Systems
Date: Fri, 25.06.2010
Time: 14:30
Duration: 90 min
Location:Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5.Stock
Contact:Helmuth Hüffel und Stefan Thurner