Calendar of Physics Talks Vienna

Correlated electrons in non-equilibrium
Speaker:Marcus Kollar (University of Augsburg)
Abstract:How is a new stationary state reached in an isolated quantum‐mechanical many body system after it has been forced out of equilibrium? What are the properties of this new state, in particular, is it the thermal state expected from statistical mechanics? For correlated electrons in condensed matter, which are not independent of each other because of the Coulomb interaction, such questions can be investigated with time‐resolved femtosecond spectroscopy, where shortly after a first laser pulse the response to a second pulse is measured. In the talk theoretical approaches that describe the real‐time dynamics of correlated systems are discussed, with an emphasis on nonequilibrium dynamical mean‐field theory for Hubbard‐type models. We show how time‐resolved spectroscopic data is related to the time‐dependent electronic quantum state. We discuss the formation of new stationary states, which is also of interest in view of experiments with cold atomic gases in optical traps.
Date: Mon, 18.01.2010
Time: 16:00
Duration: 45 min
Location:Seminar room 138C (TU Freihaus 9. Stock, gelb) Wiedenerhauptstr. 8-12
Contact:Univ.-Prof. Dr. Karsten Held

Climate change: The physical basis and latest results
Speaker:Thomas Stocker (Oeschger Centre for Climate Change Research, University of Bern)
Abstract:The latest Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) concludes: "Warming in the climate system is unequivocal." Without the contribution of Physics to climate science over many decades, such a statement would not have been possible. Experimental physics enables us to read climate archives such as polar ice cores and so provides the context for the current changes. For example, today the concentration of CO2 in the atmosphere, the second most important greenhouse gas, is 29% higher than any time during the last 800,000 years. Classical fluid mechanics and numerical mathematics are the basis of climate models from which estimates of future climate change are obtained. But major instabilities and surprises in the Earth System are still unknown. Only Physics will permit us to further improve our understanding in order to provide the foundation for policy decisions facing the global climate change challenge.
Date: Mon, 18.01.2010
Time: 17:00
Location:Universität Wien, Lise Meitner Hörsaal, Strudlhofg. 4, 1090 Wien
Contact:Prof. W. Kutschera

Vienna Theory Lunch Club - Numerical relativity and the sound of two black holes colliding
Speaker:Mark Hannam (TU Vienna)
Abstract:Accurate theoretical predictions of the gravitational-wave (GW) signals produced by the merger of two black holes may be crucial for the first direct detection of GWs; they will certainly be necessary as the new field of GW astronomy develops. The GWs predicted by Einstein's equations for black-hole mergers can only be calculated by computer simulations. I will review progress in this rapidly advancing field, and the problems that must be solved before observations of black-hole mergers can become standard tools in experimental astrophysics, cosmology and fundamental physics.
Overview Lunch Seminar
Date: Tue, 19.01.2010
Time: 12:30
Duration: 60 min
Location:TU Vienna, Inst. f. Theoretical Physics, Freihaus, Wiedner Hauptstr. 8-10, 10. OG, SEM136
Contact:Maximilian Attems, David Burke, Marcus Huber, Theo Adaktylos

Die mikrolokale Spektrumsbedingung
Speaker:Eric Morfa-Morales (Univ.Wien) (Fakultät für Physik)
Abstract:im Rahmen des Seminars für Mathematische Physik
Date: Tue, 19.01.2010
Time: 14:15
Duration: 60 min
Location:Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:J. Yngvason

A new approach to extracting bound-state parameters from dispersive sum rules
Speaker:Dmitri Melikhov (INP, Moscow State Univ. und HEPHY, Wien) (Fakultät für Physik)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Tue, 19.01.2010
Time: 16:15
Duration: 60 min
Location:Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Neufeld