Calendar of Physics Talks Vienna

Workshop: Mathematical Challenges in String Phenomenology
Speaker:R. Blumenhagen, M.R. Douglas, M. Kreuzer, E. Scheidegger (organizers) (ESI)
Abstract:Program of the second week
Date: Mon, 13.10.2008
Time: 09:30
Duration: 14400 min
Contact:M. Kreuzer

Speaker:C. W. Francis EVERITT (Stanford University)
Abstract:In 1918, Josef Lense and Hans Thirring showed that in Einstein’s beautiful new theory of gravitation, general relativity, rotating matter exerts a dragging effect on the framework of space-time. They calculated the magnitudes of expected effect on satellites in orbit around rotating planets. In this lecture I describe how, finally, 90 years later, the NASA Gravity Probe B mission, launched 20 April 2004, has provided a decisive measurement of the closely related effect on gyroscopes in earth orbit, first calculated by Leonard Schiff. The gyroscopes required a performance 107 times better than the best inertial navigation gyroscopes. Developing them and the many other new technologies for the mission proved a fascinating and sometimes daunting task, including a three-way collaboration between Stanford University, aerospace industry and NASA. The contributions of students, both physics and engineering, have been extraordinarily impressive. I shall conclude with some observations on the wider significance of the GP-B experience.
Date: Mon, 13.10.2008
Time: 17:30
Duration: 60 min
Location:Großer Hörsaal für Experimentalphysik der Universität Wien Strudlhofgasse 4/1. Stock, A-1090 Wien
Contact:Wiener Physikalisches Kolloquium, Jörg Schmiedmayer

Pizza Seminar - Recent developments in 3d gravity
Speaker:Niklas Johansson (Uppsala University)
Abstract:A consistent quantization of three-dimensional AdS gravity would be of great interest, since this theory contains black holes. Recently, a chiral version of 3D topologically massive gravity was constructed. This theory has many appealing features. Its CFT dual was conjectured to be purely right moving, and therefore holomorphic. In this talk we review this construction, and the sometimes heated debate regarding its properties.
Date: Tue, 14.10.2008
Time: 12:30
Duration: 60 min
Location:University of Vienna, Boltzmanngasse 5, 5th Floor, Large Seminar Room
Contact:Max Attems, Daniel Grumiller, Beatrix Hiesmayr

On the Use of Topological Degrees of Freedom in Electrodynamics for Radio-Based Space Physics, Astrophysics, and Communications
Speaker:Prof. Bo Thidé (Swedish Institute of Space Physics, Uppsala, Sweden )
Abstract:Using the full symmetry of the electromagnetic field, in particular its angular momentum and other topological degrees of freedom, it is possible to better characterize radio signals received from space, thus facilitating the extraction of the complete information content of the signals and to improve communication protocols. We have shown how this can be accomplished in the radio domain with the use of vector antennas and software-controlled digital radio instrumentation. This allows full control, in software, of field quantities of any order and therefore the technique can be used for fundamental studies of EM orbital angular momentum and related quantities.
Date: Tue, 14.10.2008
Time: 14:00
Location: IQOQI-Seminarraum 2.08, 2nd Floor Boltzmanngasse 3, 1090 Vienna
Contact:Markus Arndt

Bewertung und Verminderung von Straßenverkehrslärm
Speaker:Reinhard Wehr (arsenal research, Wien, Geschäftsfeld Verkehrswege)
Abstract:Straßenverkehrslärm ist ein seit vielen Jahren bekanntes, aber dennoch stetig anwachsendes Problem für viele Anwohner an Hauptverkehrsrouten. Die Hauptursachen sind dabei in einem breiten Geschwindigkeitsbereich weniger im Motorengeräusch, als vielmehr im Abrollgeräusch der Reifen zu finden, das insbesondere vom Reifenprofil und der Fahrbahntextur abhängig ist. Im ersten Teil des Vortrages wird ein Überblick über die Problematik des Verkehrslärms gegeben. Weiters werden einige Messverfahren zur Bewertung des Abrollgeräusches vorgestellt. Im zweiten Teil wird das Hauptaugenmerk auf eine Diplomarbeit gelegt, die derzeit in Zusammenarbeit mit arsenal research durchgeführt wird und welche sich mit der Entwicklung eines Messsystems für die quantitative in-situ-Erfassung der akustischen Eigenschaften von Lärmschutzwänden befasst.
Date: Tue, 14.10.2008
Time: 16:00
Location:Technische Universität Wien, Institut für Allgemeine Physik, Turm B (gelbe Leitfarbe) 5.OG, Seminarraum 134A, Wiedner Hauptstraße 8-10, 1040 Wien
Contact:Ao.Univ.Prof. Dr. Martin Gröschl

Some applications of the Mellin-Barnes representation in quantum field theory
Speaker:Eduardo de Rafael (CNRS-Luminy, Marseille) (Fakultät für Physik)
Abstract:2.Vorlesung im Rahmen der Schrödinger-Gastproffesur 2008
Date: Tue, 14.10.2008
Time: 16:15
Duration: 60 min
Location:Großer Seminarraum, Boltzmanngasse 5, 5. Stock, 1090 Wien
Contact:W. Grimus, H. Neufeld

Dispersive representation and shape of Kl3 form factors
Speaker:Emilie Passemar (Univ. Bern) (Fakultät für Physik)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Thu, 16.10.2008
Time: 14:15
Duration: 60 min
Location:Großer Seminarraum, Boltzmanngasse 5, 5. Stock
Contact:H. Neufeld

Integrating optical devices with atom chips
Speaker:Michael TRUPKE (Imperial College London)
Abstract:Atom chips are powerful tools which allow the cooling, trapping and transport of atoms close to their surface. The aim of the projects described in this talk is to complement these features with the detection and manipulation techniques offered by optical devices. The talk will focus on a scalable, fibre-coupled Fabry-Perot microcavity with which we have demonstrated the detection of atoms and observed cavity-enhanced photon emission. Recent improvements of the experimental apparatus will be presented, together with an outlook on the future of these experiments.
Date: Fri, 17.10.2008
Time: 15:15
Location:Seminarraum Atominstitut, Stadionallee 2, 1020 Wien
Contact:Jörg Schmiedmayer