Calendar of Physics Talks Vienna

Amyloid Oligomers: Precursors, Competitors or Inhibitors of Fibril Formation?
Speaker:Martin Muschol (Dept. of Physics, University of South Florida Tampa FL, USA)
Abstract:Accumulation of insoluble amyloid fibrils, which are protein fibrils with a characteristic cross- sheet structure, is intimately associated with a multitude of human disorders ranging from Alzheimer's disease to type-II diabetes. However, there is a series of distinct and long-lived oligomeric precursors to fibrils which are currently believed to be the main cause of the amyloid-related pathologies. Therefore, understanding the molecular mechanisms regulating and promoting the formation of distinct species of amyloid aggregates in vitro and in vivo represents a critical step towards devising effective treatment strategies. Our lab is approaching amyloid formation as a problem of phase separation in colloidal/polymeric system. Specifically we have determined kinetic phase diagrams outlining the conditions promoting the formation of amyloid oligomers prior to fibril nucleation. In a
Date: Tue, 02.05.2017
Time: 16:00
Location:TU Wien, Institut für Angewandte Physik, E134 1040 Wien, Wiedner Hauptstraße 8-10 Yellow Tower „B“, 5th floor, SEM.R. DB gelb 05 B
Contact:Univ.Prof. Dr. G. Schütz

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.
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