Calendar of Physics Talks Vienna

Biophysics at the Nanoscale: Molecular Forces, Dynamics and Biomimetics
Speaker:Berufungsvortrag Biophysik: Prof. Dr. Dario Anselmetti (Experimental Biophysics & Applied Nanoscience, Bielefeld University Bielefeld Institute for Biophysics and Nanoscience (BINAS))
Abstract:The detection and quantitative analysis of single (bio)molecules, smallest analyte quantities and the hunt for low abundant proteins at the single cell level, require new sensitive and efficient techniques. Over the last 15 years, novel biophysical measurement concepts have been conceived with an offspring of ultrasensitive methods that allow to image, measure, analyze, steer, and manipulate individual (bio)molecules and cells by atomic force microscopy / force spectroscopy, optical tweezers, micro- and nanofluidics and single molecule optical microscopy beyond the diffraction limit. Beyond more fundamental investigations of complex biomolecular reactions, where a quantitative and more detailed insight into the physical mechanism of specific interaction, binding kinetics, and (non-linear) dynamics at the single molecule or single cell level can be achieved, especially, novel concepts with (switchable and bistable) supramolecular host-guest molecules and artificial nanopores will allow fascinating applications and in the fields of biomimetics, synthetic biology and molecular biomedicine.
Date: Mon, 31.05.2010
Time: 14:00
Duration: 60 min
Location:Technische Universität Wien, Freihaus Hörsaal 1, Turm C (rote Leitfarbe), 1.u.2. OG, 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Ao.Univ.Prof. Dr. Herbert Störi

Ultrafast Energy Transfer
Speaker:Prof. Lorenz Cederbaum (Universität Heidelberg)
Abstract:How does a microscopic system like an atom or a small molecules get rid of the excess electronic energy it has acquired, for instance, by absorbing a photon? If this microscopic system is isolated, the issue is much investigated and the answer to this question is more or less well known. But what happens if our system has neighbors as is usually the case in nature or in the laboratory? In a human society, if our stress is large, we would like to pass it over to our neighbors. Indeed, this is in brief what happens also to the sufficiently excited microscopic system. A new mechanism of energy transfer has been theoretically predicted and verified in several exciting experiments. This mechanism seems to prevail “everywhere” from the extreme quantum system of the He dimer to water and even to quantum dots. The transfer is ultrafast and typically dominates other relaxation pathways.
Date: Mon, 31.05.2010
Time: 17:30
Duration: 60 min
Location:TU Wien, Schütte-Lihotzky Hörsaal (Nr. 7), Karlsplatz 13, 1040 Wien
Contact:Prof. Jörg Schmiedmayer

Elements of Loop Quantum Gravity
Speaker:Wolfgang Wieland (TU Wien)
Abstract:Loop Quantum gravity (LQG) is an attempt to construct a canonical quantisation of the gravitational field. Starting with an elementary --i.e. understandable-- introduction to the theory I will first discuss the construction of the underlying Hilbert space of LQG together with the major predictions on the so-called kinematical level. These include the fundamental discreteness of geometry at the Planck-scale, represented by the discrete spectrum of geometric operators corresponding to classical length, area and volume. After this introduction I will present recent developments of our group concerning the quantisation of the so-called Hamiltonian constraint, implementing the dynamics of the theory. Lunch Club Overview
Date: Tue, 01.06.2010
Time: 12:30
Duration: 60 min
Location:Vienna University of Technology, Seminar Room E136, 10th floor
Contact:Theo Adaktylos, David Burke, Andreas Gabriel, Niklas Johansson & Christoph Spengler

Detection of high-dimensional genuine multi-partite entanglement of mixed states
Speaker:Marcus Huber (Univ.Wien) (Fakultät für Physik)
Abstract:im Rahmen des Seminars für Mathematische Physik
Date: Tue, 01.06.2010
Time: 14:15
Duration: 60 min
Location:Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:J. Yngvason

E Theory (first lecture)
Speaker:Peter West (King's College, London)
Abstract:After reviewing the theory of finite dimensional semi-simple Lie algebras and then Kac-Moody algebras, I will present the evidence for an E11 symmetry of an underlying theory of strings and branes.
Date: Wed, 02.06.2010
Time: 15:00
Duration: 120 min
Location:ESI, Schrödinger lecture hall
Contact:Erwin Schrödinger Institute

The Cauchy problem on a light cone
Speaker:Piotr T. Chrusciel (Univ. Wien) (Fakultät für Physik)
Date: Fri, 04.06.2010
Time: 13:30
Duration: 60 min
Location:Währinger Straße 17, Seminarraum A, 2. Stock
Contact:P.T. Chrusciel

Fractional Charges and Zero Modes & Majorana Fermions in Superconductors
Speaker:Roman Jackiw (Massachusetts Institute of Technology)
Abstract:The essence of quantum mechanics is that dynamical entities, like energy or angular momentum, which can take arbitrary values within classical physics, become quantized within quantum physics. I shall describe an inverse phenomenon: Classical entities like particle number or charge possess an intrinsic integrality; but they can acquire fractional values upon quantization. I shall describe how this phenomenon is realized through zero modes of a Dirac equation, and how the effect manifests itself in condensed matter materials.
Date: Fri, 04.06.2010
Time: 14:15
Duration: 60 min
Location:Vienna University of Technology, Freihaus, HS 5 (2nd floor, green tower)
Contact:Daniel Grumiller