Calendar of Physics Talks Vienna

Can distinct quantum state vectors correspond to the same physical state? A no-go theorem and an experimental test
Speaker:Jonathan Barrett (Oxford University)
Abstract:A century on from the development of quantum theory, the interpretation of a quantum state is still discussed. If a physicist claims to have produced a system with a particular wave function, does this represent directly a physical wave of some kind, or is the wave function merely a summary of knowledge, or information, about the system? A recent no-go theorem shows that if the wave function merely represents an experimenter’s information about an underlying objective state of the system, then different predictions from quantum theory are obtained. I will present the argument and explain what kind of models are ruled out. I will also briefly present an experimental test using trapped ions, the results of which confirm quantum theory.
Date: Mon, 05.11.2012
Time: 17:30
Duration: 60 min
Location:Univ. of Vienna, Ernst-Mach Hörsaal, Boltzmanngasse 5, 2nd floor, 1090 Wien
Contact:Dr. Christiane Losert / Univ. of Vienna

The molecules' dance in laser light
Speaker:Katharina Doblhoff-Dier (TU Wien)
Abstract:When atoms and molecules are subjected to intense light, all electrons and cores start moving in the laser's electric field. Today, laser-fields can be made so short and so intense and are so well controllable that experimentalists have started to explore the possibility to control the molecules movement by shaping the light fields. However, in many cases, the underlying mechanisms are not yet understood and the analysis is difficult since "slow" processes such as vibrational and rotational dynamics are governed by much faster electronic processes. Yet, thorough understanding of the molecular processes triggered by the laser interaction is necessary if we want to control the molecules' dynamics in laser light. In this talk, I will give an introduction on how molecules interact with laser light, and how this can be described theoretically.
Date: Tue, 06.11.2012
Time: 12:30
Duration: 60 min
Location:Univ. of Vienna, Faculty of Physics, Boltzmanngasse 5, 5th floor, Erwin Schrödinger Lecture Hall
Contact:F. Brünner, S. Frank, P. Köhler, A. G. Passegger, S. Stetina - www.univie.ac.at/lunch-seminar

AdS/QCD, Light-Front Holography, and Color Confinement
Speaker:Stanley Brodsky (SLAC, Stanford University)
Abstract:The AdS/CFT correspondence between gravitational theories in higher dimensional anti-de Sitter (AdS) space and conformal field theories in physical space-time has led to a remarkable one-parameter semiclassical approximation to non-perturbative hadron dynamics called AdS/QCD. If the conformal AdS metric is modified by a dilaton field to provide color confinement, one derives relativistic, frame-independent, bound-state Klein-Gordon and Dirac equations whose mass eigenvalues give a realistic description of the light-quark meson and baryon spectra, including a zero-mass pion in the chiral limit and Regge-like linear trajectories with the same slope in the hadron's internal orbital angular momentum and radial quantum number. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to light-front wavefunctions of hadrons.
Date: Tue, 06.11.2012
Time: 14:15
Duration: 60 min
Location:TU Wien, Inst.f.Theoret.Physik, Wiedner Hauptstr. 8-10, 10th floor, SEM136
Contact:Anton Rebhan

Direct observation of lipid flux from single HDL particles into biomembranes
Speaker:Dr. Birgit Plochberger (Technische Universität Wien, Institut für Angewandte Physik)
Abstract:The High Density Lipoprotein (HDL) is one of the smallest and densest lipoproteins and carries besides their protein parts various lipids. Hitherto, the mechanisms how lipids flow from lipoproteins into the cellular plasma-membrane are far from being understood: it remains elusive whether receptors directly influence lipid efflux or keeps the lipoprotein particle attached to the plasma-membrane, thereby enhancing the probability for lipid transfer. In this study we provide a mechanistic understanding of the cargo exchange process between HDL and biomembranes. The interaction between HDL and synthetic lipid membranes was investigated with force spectroscopy and high speed atomic force microscopy; the transfer of single cargo molecules was directly visualized using a combined and simultaneously operating fluorescence and force microscope. In particular, we compared the transfer of the flu
Date: Tue, 06.11.2012
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134A, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Univ.Prof. Dr. Gerhard Schütz

Atoms in free fall and at rest
Speaker:Helmut Rumpf (Univ.Wien)
Abstract:im Rahmen des Literaturseminars
Date: Wed, 07.11.2012
Time: 14:15
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock
Contact:R. Beig

The Principle of Maximum Conformality and High Precision pQCD Predictions
Speaker:Stanley Brodsky (SLAC National Accelerator Laboratory, Stanford)
Abstract:zur 4. Vorlesung im Rahmen der Schrödinger-Gastprofessur 2012
Date: Thu, 08.11.2012
Time: 14:15
Duration: 90 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, H. Neufeld

Statistical mechanical foundations of complexity
Speaker:Constantino Tsallis (Centro Brasileiro de Pesquisas Fisicas)
Abstract:im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische Systeme" (Univ.Wien) und "Analyse Komplexer Systeme" (Mediz.Univ.Wien)
Date: Fri, 09.11.2012
Time: 14:15
Duration: 90 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Hüffel, Stefan Thurner