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Calendar of Physics Talks Vienna
| Speaker: | Raphael Holzinger (Univ. Wien) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik: We discuss fuzzy C
P^2, which is a basic example of a 4-dimensional compact quantized
symplectic space embedded in R^8. The construction in terms of 3
harmonic oscillator algebras and the relation with representations
of SU(3) is reviewed.
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| Date: | Tue, 09.12.2014 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | H. Steinacker |
| Assessment of ocular microcirculation in rodents using optical coherence tomography |
| Speaker: | Dipl.-Ing. Martin Vietauer (TU Wien, IAP and Center for Medical Physics and Biomedical Engineering,
Medical University of Vienna) |
| Abstract: | Numerous ocular diseases, such as diabetic retinopathy, glaucoma, and macula degeneration, are related to changes in retinal blood flow. Animal models allow the study of various ocular diseases under controlled conditions and, hence, are required to gain a deeper understanding of the correlation between the dysfunction in perfusion and the pathological mechanisms underlying these diseases. Recently, a lot of research has been done in the field of Optical Coherence Tomography, to allow the non-invasive measurement of changes in retinal perfusion.
This presentation illustrates the basic physical principles as well as the setup of a Doppler Fourier-Domain Optical Coherence Tomograph combined with a commercial Retinal Vessel Analyzer. Special techniques are introduced to detect velocity changes in small capillaries with diameters in the range of 10 µm. Results achieved by this novel measurem |
| Date: | Tue, 09.12.2014 |
| Time: | 16:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Seminarraum 134A (room number DB05L03) 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Ao.Univ.Prof. Dr. Martin Gröschl |
| Phenomenology of scenarios with flavor and CP symmetries |
| Speaker: | Claudia Hagedorn (TU München) |
| Abstract: | im Rahmen des Teilchenphysikseminars: I consider a theory (for leptons)
with a flavor and a CP symmetry. First, I discuss that the choice of
these symmetries is subject to certain constraints. Then, I show that
lepton mixing angles as well as the Dirac and the Majorana phases can
be predicted in terms of quantities determined by the symmetries of the
theory and only one continuous parameter, if these symmetries are
broken to residual ones in the charged lepton and neutrino sector. The
predictive power of this approach is exemplified with the flavor groups
Delta (6 n^2). Furthermore, I study neutrinoless double beta decay in
such a theory. |
| Date: | Tue, 09.12.2014 |
| Time: | 16:15 |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, W. Grimus |
| Environment Induced Entanglement in Mesoscopic Systems |
| Speaker: | Federico Carollo (University of Trieste) |
| Abstract: | Mini-Symposium - "On Entanglement" |
| Date: | Wed, 10.12.2014 |
| Time: | 13:00 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Kleiner Seminarraum, 5. Stock, Boltzmanngasse 5, 1090 Wien |
| Contact: | B. Hiesmayr, H. Narnhofer |
| Genuine Multipartite Entanglement in XY & Cluster-Ising Models and Quantum Frustration |
| Speaker: | Marco Giampaolo (University of Vienna) |
| Abstract: | Mini-Symposium - “On Entanglement” |
| Date: | Wed, 10.12.2014 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Kleiner Seminarraum, 5. Stock, Boltzmanngasse 5, 1090 Wien |
| Contact: | B. Hiesmayr, H. Narnhofer |
| Curved and helical polyaromatic molecules at surfaces: From 2D self-assembly to organic electronics |
| Speaker: | Prof. Dr. Karl-Heinz Ernst (Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf/Switzerland and Department of Chemistry, University Zürich/Switzerland) |
| Abstract: | Modification of surfaces with aromatic organic molecules is the key approach to new materials for organic photovoltaics (OPV), organic lightemitting devices (OLEDs), and molecular electronics such as organic field effect transistors (OFETs). The interfaces between active layers and electrodes influence the electronic and optical properties as well as the device performance. Furthermore, because the spatial extent of the molecular wavefunctions is rarely isotropic, the relative orientation of the molecules in the film, and thereby the degree of overlap of the frontier orbitals, will play an important role in determining film properties. Bowland helically shaped polynuclear hydrocarbons offer a special opportunity in this arena owing to their substantial dipole moment, large conjugated network and shape complementarity.
I will present different aspects of the consequences of adsorption of |
| Date: | Wed, 10.12.2014 |
| Time: | 16:30 |
| Location: | Technische Universität Wien, Chemiehochhaus, Getreidemarkt 9, Bauteil BA, Hochhaus, 10th floor, Seminarraum BA 10B |
| Contact: | Univ.Prof. Dr. Ulrike Diebold |
| Global dynamics of a Yang-Mills field on an asymptotically hyperbolic space |
| Speaker: | Patryk Mach (Cracow) |
| Abstract: | im Rahmen des Literaturseminars für Gravitationsphysik: We consider
a spherically symmetric (purely magnetic) SU(2) Yang-Mills field
propagating on an ultrastatic spacetime with two asymptotically
hyperbolic regions connected by a throat of radius α. Static solutions
in this model are shown to exhibit an interesting bifurcation pattern
in the parameter α. We relate this pattern to the Morse index of the
static solution with maximal energy. Using a hyperboloidal approach to
the initial value problem, we describe the relaxation to the ground
state solution for generic initial data and unstable static solutions
for initial data of codimension one, two, and three.
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| Date: | Thu, 11.12.2014 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| Chern-Simons-like Theories of Gravity |
| Speaker: | Wout Merbis (TU Wien) |
| Abstract: | I will discuss how a wide class of three-dimensional massive gravity
models can be brought in a first-order, Chern-Simons-like,
formulation. This allows for a general analysis of the Hamiltonian
for this wide class of models. From the Chern-Simons-like
perspective, the known higher-derivative theories of 3D massive
gravity, like Topologically Massive Gravity and New Massive Gravity,
can be extended to a wider class of models. These models are shown to
be free of (possibly ghost-like) scalar excitations and exhibit
improved behavior with respect to Anti-de Sitter holography; the new
models have regions in their parameter space where positive boundary
central charge is compatible with positive mass and energy for the
massive spin-2 mode. |
| Date: | Thu, 11.12.2014 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna) |
| Contact: | Daniel Grumiller and Johanna Knapp |
| Quantum measurement backaction : From single atoms to optomechanical systems |
| Speaker: | Mukund Vengalattore (Cornell University) |
| Abstract: | The act of measurement has profound consequences on a quantum system. I will describe our studies on measurement-induced dynamics of an ultracold lattice gas. Using a nondestructive imaging technique that preserves the quantum state of the atoms, we show that the act of imaging these atoms induces their localization - a manifestation of the quantum Zeno effect. Further, by gradually increasing the rate of position measurements, we observe the crossover from a regime of 'weak measurements' - where the act of observation has negligible influence on quantum motion, to the regime of 'strong measurements' - where measurements cause strong localization. This crossover is an instance of emergent classicality in a quantum system when subjected to rapid measurements. I will also discuss our ongoing efforts to extend such measurement-backaction schemes to control macroscopic quantum systems for ap |
| Date: | Sun, 14.12.2014 |
| Time: | 17:30 |
| Duration: | 60 min |
| Location: | Ernst-Mach Hörsaal, 2. Stck.,Strudlhofgasse 4, 1090 Wien |
| Contact: | www.coqus.at / Christina Becker |
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