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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 |
| Location: | ESI |
| Contact: | M. Kreuzer |
| 90 YEARS ON: THE LONG PATH TO MEASURING FRAME-DRAGGING |
| 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.
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| 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.
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| Date: | Fri, 17.10.2008 |
| Time: | 15:15 |
| Location: | Seminarraum Atominstitut, Stadionallee 2, 1020 Wien |
| Contact: | Jörg Schmiedmayer |
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