Calendar of Physics Talks Vienna

Evaluating the second order exchange contribution to the polarizability by means of Feynman diagrams
Speaker:Felix Hummel (University of Vienna)
Abstract:Many methods in correlated electronic structure calculation estimate the dominant set of interaction processes among all possible ones to improve precision while maintaining computational efficiency. We approximate the second order exchange (SOEX) contribution to the polarizability of materials by the respective SOEX contribution in the uniform electron gas. This can be computed much faster while we still believe to capture the dominant part of this contribution for many materials. Monte Carlo integration with importance sampling and symmetrization considerations is used to integrate the divergent kernels of the SOEX contribution to the polarizability numerically as a function of momentum and frequency. Correlated electronic structure calculation methods such as the Random Phase Approximation (RPA) can then be amended using this polarizability.
Date: Tue, 22.10.2013
Time: 12:30
Duration: 60 min
Location:Univ. of Vienna, Faculty of Physics, Boltzmanngasse 5, 5th floor, Erwin Schrödinger Lecture Hall
Contact:Albert Georg Passegger, Peter Poier - www.univie.ac.at/lunch-seminar

Microscopic Derivation of the Ginzburg-Landau Model
Speaker:Robert Seiringer (IST Austria, Klosterneuburg)
Abstract:im Rahmen des Seminars für Mathematische Physik
Date: Tue, 22.10.2013
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:J. Yngvason

Guided transmission of highly charged ions through insulating nanocapillaries: experiments and simulations
Speaker:Dr. Nico Stolterfoht (Helmholtz-Zentrum für Materialien und Energie, Berlin/D)
Abstract:In the past few years guiding of highly-charged ions through insulating capillaries has received considerable attention. Capillaries in insulating materials keep charges deposited by the incident ions for a relatively long time on the inner capillary wall so that a repulsive electric field is produced in self-organizing manner. This field deflects the following ions at significant distances so that electron capture into the projectile is inhibited. Thus, a large amount of ions are guided in their initial charge state along the capillary even when the capillary axis is tilted with respect to the incident beam direction. After a general introduction of the self-organizing guiding mechanism, experimental results are presented. Scaling laws of guiding for varying energy and charge state of the projectile are discussed. Dynamic properties are analyzed in terms of temporary charge patches with
Date: Tue, 22.10.2013
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134A, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Univ.Prof. Dr. F. Aumayr

Parton distribution functions for LHC
Speaker:Karol Kovarik (Karlsruhe)
Abstract:I will introduce parton distribution functions (PDFs) at a pedestrian level and review the most important parametrizations and their differences. During the whole talk, the focus will be on the LHC, since its analysis are the main application nowadays and, moreover, it provides information about QCD that is relevant for the PDFs. I will point out areas where LHC contributes to the knowledge of PDFs and discuss, in turn, PDF related aspects one is facing in analysis. Finally, I‘ll give some prospect on w­here PDF fitting is heading in the future.
Date: Tue, 22.10.2013
Time: 17:00
Duration: 60 min
Location:Hephy Vienna, Nikolsdorfergasse 18, 1050 Wien (Bibliothek)

Facets of Chiral Perturbation Theory
Speaker:Gerhard Ecker (Univ.Wien)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Thu, 24.10.2013
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Neufeld

Null foliatons and ultrarelativistic geometry
Speaker:Albert Huber (TU Wien)
Abstract:im Rahmen des Literaturseminars
Date: Thu, 24.10.2013
Time: 14:15
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Seminarraum Physik, Sensengasse 8 (Erdgeschoß)
Contact:H. Rumpf

Nuclear Fission Modeling at LANL
Speaker:Dr. Patrick Talou (E-141/Atominstitut)
Date: Fri, 25.10.2013
Time: 13:30
Duration: 120 min
Location:138A, Turm B, gelber Bereich, 7. OG