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Calendar of Physics Talks Vienna
| Higgs physics: where are we and what next? |
| Speaker: | Georg Weiglein (DESY, Hamburg) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Tue, 02.05.2017 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| Radio detection: a new observation technique to investigate the Ultra-High-Energy Cosmic Ray mysteries |
| Speaker: | Sijbrand de Jong (University of Nijmegen) |
| Abstract: | Ultra-High-Energy Cosmic Rays (UHECRs) have been found with energies as
high as 10^20 eV in a single subatomic particle. The 3000 km^2 Pierre
Auger Observatory has collected data over the past 15 years that
confirmed a predicted cut-off at ultra-high energy. However, it also
introduced new mysteries surrounding these UHECRs. At this moment we
must admit that we do not know their sources, their propagate through
the universe, or even their particle type is.
The detection of UHECRs using the radio frequency signals they produce
in the atmosphere, which was developed over the last decade, is a new
and powerful tool to solve the current mysteries surrounding UHECRs.
In this talk I will introduce the open questions on UHECRs and discuss
the mechanism, status and prospects for radio detection of UHECRs. |
| Date: | Thu, 04.05.2017 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Institut für Hochenergiephysik, Wohllebengasse 12-14, Seminarraum |
| Contact: | Jochen Schieck |
| The excitation spectrum in a Bose fluid |
| Speaker: | Robert Seiringer (ISTA) |
| Abstract: | Joint relativity - mathematical physics seminar: Of particular relevance for an understanding of the low-temperature properties of a quantum system is the excitation spectrum. With the exception of exactly solvable models in one dimension, rigorous results on its structure are lacking and one has to resort to adhoc approximations to make predictions. We present recent progress on this question for bosonic many-body quantum systems with weak two-body interactions. Such systems are currently
of great interest, due to their experimental realization in ultra-cold atomic gases.
We investigate the accuracy of the Bogoliubov approximations, which predicts that the
low-energy spectrum is made up of sums of elementary excitations, with linear dispersion
law at low momentum. The latter property is crucial for the superfluid behavior of the system.
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| Date: | Thu, 04.05.2017 |
| Time: | 14:00 |
| Duration: | 90 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Victor-Franz-Hess-Hörsaal, Kavalierstrakt, 1. Stock |
| Contact: | P.T. Chrusciel |
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