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Calendar of Physics Talks Vienna
| Quantum interferometric visibility as a witness of general relativistic proper time |
| Speaker: | Magdalena Zych (Uni Wien) |
| Abstract: | Current attempts to probe general relativistic effects in quantum mechanics focus on precision measurements of phase shifts in matter-wave interferometry. Yet, phase shifts can always be explained as arising due to an Aharonov-Bohm effect, where a particle in a flat space-time is subject to an effective potential. Here we propose a novel quantum effect that cannot be explained without the general relativistic notion of proper time. We consider interference of a "clock" - a particle with evolving internal degrees of freedom - that will not only display a phase shift, but also reduce the visibility of the interference pattern. According to general relativity proper time flows at different rates in different regions of space-time. Therefore, due to quantum complementarity the visibility will drop to the extent to which the path information becomes available from reading out the proper time from the "clock". Such a gravitationally induced decoherence would provide the first test of a genuine general relativistic notion of proper time in quantum mechanics. |
| Date: | Tue, 08.11.2011 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | Uni Wien ( Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room ) |
| Contact: | Sabine Ertl |
| String- and brane-localized causal fields in a strongly nonlocal model (by Buchholz and Summers) |
| Speaker: | Sabina Alazzawi (Univ.Wien) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik |
| Date: | Tue, 08.11.2011 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | J. Yngvason |
| Relating the N=4 SYM low-energy effective action with D3 brane on AdS_5 x S5 background |
| Speaker: | Igor Samsonov (INFN, Padua) |
| Abstract: | According to the AdS/CFT correspondence, the action for a D3 brane
moving in curved AdS_5 x S5 background of IIB theory should
coincide with the quantum low-energy effective action in the N=4
SYM theory. This correspondence can be checked explicitly for
several leading terms in these actions, in particular, for
F4/X4, F6/X8 and for the Wess-Zumino terms. Here F is the
Maxwell field strength and X is the R-invariant combination of
six scalar fields in the N=4 SYM theory. We discuss some
superspace methods to study this matching. |
| Date: | Tue, 08.11.2011 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | Harold Steinacker |
| g-2 and ∆α (M_Z^2): touchstone of the Standard Model, keyhole to New Physics? |
| Speaker: | Thomas Teubner (Liverpool Univ.) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Tue, 08.11.2011 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | A. Hoang, H. Neufeld |
| Inequalities between area, angular momentum, charge and the cosmological constant for marginally trapped surfaces” |
| Speaker: | Walter SIMON (Univ.Wien) |
| Abstract: | im Rahmen des Literaturseminars |
| Date: | Thu, 10.11.2011 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock |
| Contact: | R. Beig |
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