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Calendar of Physics Talks Vienna
| Quantized cosmological constant in 1+1d gravity with scalar matter |
| Speaker: | Simone Zonetti (CP3 - Centre for Cosmology, Particle Physics and Phenomenology Louvain-La-Neuve, Belgium) |
| Abstract: | Considering a model of gravity in 1+1 dimensions non-minimally coupled to scalar matter I will show how the realization of quantum constraints on physical states provides a mathematical mechanism to derive the value of the cosmological constant, accounting for the quantum contributions of matter and gravity.
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| Date: | Mon, 06.06.2011 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | SEM 136 (Freihaus, Wiedner Hauptstrasse 8-10), Institute for Theoretical Physics, Vienna University of Technology |
| Contact: | Daniel Grumiller |
| Device-Independent Quantum Information Processing |
| Speaker: | Antonio Acin (ICFO - The Institute of Photonic Sciences) |
| Abstract: | Device-Independent Quantum Information Processing represents a new paradigm for quantum information processing: the goal is to design protocols to solve relevant information tasks without relying on any assumption on the devices used in the protocol. The main resource for device-independent quantum information processing is quantum non-locality, that is, those correlations without classical analog that can be obtained by measuring some entangled states. The talk gives an introduction to the device-independent scenario, with an emphasis on two applications: key distribution and randomness generation. |
| Date: | Mon, 06.06.2011 |
| Time: | 17:30 |
| Duration: | 60 min |
| Location: | Atominstitut, großer Hörsaal, Stadionallee 2, 1020 Wien |
| Contact: | christiane.losert@univie.ac.at |
| Attosecond physics - Ultrafast electron dynamics in atoms |
| Speaker: | Renate Pazourek (TU Wien) |
| Abstract: | With the ability to control and shape infrared laser fields and the generation of isolated attosecond light pulses by high harmonic generation a new research field ? attoscience - was born about ten years ago. Since then it has become possible to study electron dynamics in atoms, molecules and solids on it's natural time scale. After a general introduction to attosecond physics I will focus on ultrafast electron dynamics in atoms, in particular correlated electron dynamics in helium for which the time-dependent Schr¿dinger equation can still be solved numerically. I will present simulations for two-photon double ionization of helium and compare some of the calculated results with experiments. In addition, I will give an introduction to attosecond streaking, a pump-probe technique using an ultrashort extreme ultaviolet pulse and a synchronized IR laser field, which allows to extract time shifts between different photoionization events with attosecond precision. |
| Date: | Tue, 07.06.2011 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | Uni Wien ( Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room ) |
| Contact: | Sabine Ertl |
| Computer modeling of laser-induced lesions to the eye: threshold thermal injuries in laboratory animals |
| Speaker: | Mathieu Jean, M.Sc. (TU Wien und Seibersdorf Laboratories GmbH) |
| Abstract: | Ocular tissues are by far the most vulnerable to optical radiation. Among various possible damage mechanisms, pure thermal damage occurs for exposures longer than approximately several µs, where the cornea and the retina are the primary targets depending on the wavelength and the spatial extent of the source. Macaque monkey and rabbit are the most suitable experimental models for the retina and the cornea, respectively. Safety guidelines and subsequent norms are up to now almost entirely supported by these expensive, time-consuming and ethically disputable experiments. A physics-based model should provide a reliable alternative. The current computerized approach basically consists of an optical model (for absorption, refraction and reflection), a thermal model solved by means of finite elements (taking conduction and convection into account) and a damage model using the Arrhenius equation for reaction kinetics. Despite experimental uncertainty and modeling inaccuracy, experimental results are reproducible within a satisfactory factor of 2. |
| Date: | Tue, 07.06.2011 |
| 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: | Ao.Univ.Prof. Dr. Wolfgang Husinsky |
| Graphene - why all the excitement about a single layer of graphite |
| Speaker: | Prof. Dr. Karsten Horn (Fritz-Haber-Institut, Berlin) |
| Abstract: | im Rahmen der Chemisch-Physikalischen Gesellschaft
Within the short time span of five years, graphene, a single layer of carbon atoms arranged in a honeycomb lattice, has risen from obscurity to worldwide attention and fame, not least as a consequence of the 2010 Nobel Prize in Physics awarded to Geim and Novoselov. This intense interest is due to graphene’s unique physical properties, many of which are a consequence of its unusual electronic structure (massless “Dirac Fermion” charge carriers), requiring a description in terms of quantum electrodynamics.
Graphene (“the thinnest material conceivable”) is a model system for 2-dimensional solids, and it is also interesting from a materials application perspective, since it has the potential to play an important role in technology (although this is sometimes exaggerated, at least in the popular press). It is also a boon for surface scientists, since here at last is a material that is all surface and no bulk! In the talk I will deal with the analysis of graphene’s properties on the basis of experimental data from a range of surface-related techniques. Beyond a characterization of the material itself, issues such as preparation and modification of graphene films and emerging laboratory-type applications will be briefly discussed. |
| Date: | Tue, 07.06.2011 |
| Time: | 17:30 |
| Location: | Lise-Meitner-Hörsaal, Fakultät für Physik, Universität Wien, 1090 Wien, Strudlhofgasse 4/Boltzmanngasse 5, 1. Stock Barrierefreier Zugang: Boltzmanngasse 5, Lift, 1. Stock rechts über den Gang zum Hi |
| Contact: | Ao.Univ.Prod. Dr. Peter Mohn |
| The Geometry Behind Matrix Models for 3D SUSY Gauge Theories at Large N |
| Speaker: | Christopher P. Herzog (Princeton University) |
| Date: | Wed, 08.06.2011 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | Institute for Theoretical Physics, TU Wien, SEM 136, 10th floor, Wiedner Hauptstr. 8-10, 1040 Wien |
| Contact: | Anton Rebhan, TU Wien |
| Dark matter; is this really a problem? |
| Speaker: | Prof. Donald G. Saari (Univ. of California Irvine) |
| Abstract: | The issue concerning "dark matter" comes from Newtonian
approximations for the full Newtonian N-body problem. As shown, when
combined with observed rotational velocities, this approach requires
mass levels that are significantly larger than what has been observed.
But, is this approximation method correct? By using analytic properties
of the Newtonian N-body problem to derive new relationships between
rotational velocity and mass values, it is shown that the conflict is
nowhere near as extreme as asserted in the literature. |
| Date: | Thu, 09.06.2011 |
| Time: | 10:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock |
| Contact: | P. T. Chrusciel |
| Speaker: | Erwann Delay (Avignon) |
| Abstract: | im Rahmen des Literaturseminars |
| Date: | Thu, 09.06.2011 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock |
| Contact: | P. T. Chrusciel |
| Soft and hard mesons in Chiral Perturbation Theory |
| Speaker: | Ilaria Jemos (Univ. Lund) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Thu, 09.06.2011 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Teilchenphysik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| N=1 Vacua in N=2 Supergravity and String Theory |
| Speaker: | Hagen Triendl (IPhT/CEA Saclay) |
| Abstract: | We discuss N=1 vacua in spontaneously broken N=2
supergravities. We start by reviewing classical no-go theorems on
their existence and how
these no-go theorems can be circumvented for general N=2
supergravities. We construct stable N=1 vacua for any moduli space
that might arise in type II flux compactifications and discuss quantum
effects in the corresponding string theory compactifications. We also
show how integrating out the massive fields leads to an N=1 effective
theory at low energies and discuss to which extend moduli
stabilization takes place. |
| Date: | Thu, 09.06.2011 |
| Time: | 16:00 |
| Duration: | 90 min |
| Location: | TU Wien, Seminar room E136 |
| Contact: | Andreas Braun |
| Complementarity and Which-Way Measurement |
| Speaker: | Masanao OZAWA (Nagoya University) |
| Date: | Fri, 10.06.2011 |
| Time: | 15:30 |
| Location: | TU Wien Atominstitut, Hörsaal, Stadionallee 2, 1020 Wien |
| Contact: | H. Abele |
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