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Calendar of Physics Talks Vienna
| Unimodular quantum cosmology |
| Speaker: | Natascha Riahi (Vienna) |
| Abstract: | Lunchseminar: I will discuss the steps of quantization of a simple cosmological model. Starting
with the unimodular version of General Relativity the result will be an evolving
wave function. There is no need for the commonly used frozen time formalism.
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| Date: | Mon, 29.06.2015 |
| Time: | 13:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, common room, 1. Stock |
| Contact: | P.T. Chrusciel |
| The influence of coherence effects on inelastic electron scattering |
| Speaker: | Dipl.-Ing. Walid Hetaba (TU Wien, Universitäre Service Einrichtung für Transmissions-Elektronenmikroskopie (USTEM) und Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin/D) |
| Abstract: | Electron energy loss spectrometry (EELS) in the transmission electron microscope (TEM) is used to investigate not only the chemical composition of a sample but also the electronic structure. Furthermore, interference effects in the TEM give rise to a number of powerful techniques.
Combined with electron channelling (energy losses by channelled electrons, ELCE), investigations can be performed in a site-specific manner. This was applied to Rutile in order to investigate the bonding situation and the atomic orbitals. Another powerful technique presented in this talk is energy-loss magnetic chiral dichroism (EMCD), which allows the investigation of the sample’s magnetic properties. It was used to perform in-situ measurements on Heusler-alloys, which show a magneto-caloric effect related to a structural transformation. Furthermore, the change in magnetic moments due to the Verwey transition |
| Date: | Tue, 30.06.2015 |
| Time: | 16:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Seminarraum 134A (room number DB05L03) 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Ao.Univ.Prof. Dr. Herbert Störi |
| Gamma-ray searches for WIMP Dark Matter with the Fermi LAT: A Rhapsody in Blue |
| Speaker: | Christoph Weniger (GRAPPA, University of Amsterdam) |
| Abstract: | Despite the enormous success of astrophysical and cosmological research over
the last decades, about 85% of the matter content in the Universe remains
unknown. The currently leading hypothesis for this so-called dark matter are
Weakly Interacting Massive Particles (WIMPs). Currently, indirect searches for
self-annihilation products of these WIMPs in gamma rays are of particular
interest, since high-precision data from the Fermi Large Area Telescope (LAT)
allows for the first time the detailed study of a large number of promising
targets, from the inner Galaxy to dwarf spheroidal galaxies and the
extragalactic gamma-ray background. However, with increasing sensitivity it
becomes also more and more challenging to understand astrophysical foregrounds
with the required accuracy. I will give here an overview over the history,
status and possible fate of the most interesting signatures and |
| Date: | Thu, 02.07.2015 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Library, Institute of High Energy Physics (HEPHY), Nikolsdorfer Gasse 18, 1050 Wien |
| Contact: | Josef Pradler |
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