Calendar of Physics Talks Vienna

Recent developments in ROOT and ROOT6
Speaker:Axel Naumann (CERN)
Abstract:Part 1 (11:00 - 12:30): Axel Naumann is member of the core development team of ROOT at CERN. He will describe recent innovations in ROOT, with focus on ROOT6, and give an overview over further plans. Part 2 (14:30 - 16:00: In the afternoon session, Axel will answer questions about issues brought up by the users. Users will have the opportunity to present code snippets and to ask for Axel's expert opinion about the performance of the code. The users are encouraged to discuss problems they have encountered while using ROOT and to make suggestions for further improvements.
Date: Mon, 29.04.2013
Time: 11:00
Location:HEPHY Library, 1st floor, Nikolsdorfer Gasse 18, 1050 Wien
Contact:Rudolf Frühwirth, rudolf.fruehwirth@oeaw.ac.at

Higher-derivative theories
Speaker:Jerzy Kijowski (Polish Academy of Sciences, Warsaw)
Abstract:im Rahmen des Literaturseminars
Date: Thu, 02.05.2013
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock
Contact:P. Chrusciel

Light quarks and lattice QCD: from chiral perturbation theory to strong and electromagnetic isospin breaking effects
Speaker:Laurent Lellouch (Centre de Physique Théorique, CNRS/INP and Aix-Marseille U.)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Thu, 02.05.2013
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:G. Ecker, H. Neufeld

Community Detection in Graphs
Speaker:Christos Tsiapalis (Medical Univ.of Vienna)
Abstract:to a jointly organized seminar in the field of "Complex Stochastic Systems" (Univ.of Vienna) and "Analysis of Complex Systems" (Medical Univ.of Vienna)
Date: Fri, 03.05.2013
Time: 14:15
Duration: 90 min
Location:Medical Univ. of Vienna, CeMSIIS; Spitalgasse 23, Building 88, Informatics Library, 3rd floor
Contact:H. Hüffel, Stefan Thurner

Search for gauge bosons of the dark sector at the Mainz Microtron
Speaker:Harald MERKEL (Institut für Kernphysik, Universität Mainz)
Abstract:The cosmological standard model assumes that a large fraction of the universe is made of dark matter while only a small fraction of matter is made of ordinary baryonic matter. Up to now, the nature of dark matter is unknown, and this is certainly one of the most pressing puzzles of today's physics. Dark matter interacts in cosmology only via gravitation with ordinary matter. In particle physics, however, one assumes that for a possible particle candidate at least a very weak interaction with ordinary matter remains, calling such a candidate a "weakly interacting massive particle" (WIMP). A particle physics candidate would appear naturally e.g. if one demands R-parity in Super-symmetry. Most experiments therefore concentrate on the direct detection of the so called "lightest super-symmetric particle'" as the WIMP. A more general approach however was suggested by Arkani-Hamed et al. [1], explaining a series of puzzling phenomena like e.g. the DAMA/LIBRA modulation and the positron excess recently confirmed by the newest AMS results by a U(1) gauge boson of the dark matter sector which mixes with the photon. Besides Super-symmetry, nearly all well motivated extensions of the standard model, e.g. string theories, introduce an additional gauge boson, since large symmetries have to be broken and U(1) bosons provide the lowest-rank local symmetries. Such gauge bosons would have naturally a mass in the range of 1 GeV, making this accessible to existing accelerators, however with very small coupling. In this talk the experimental program for the search for light gauge bosons at the Mainz Microtron (MAMI) will be presented, using the experimental methods developed by Bjorken et al. [2]. It will be shown, that the high luminosity of a high current continuous wave electron accelerator in combination with the high resolution of magnetic spectrometers provides a unique tool to extend possible exclusion limits for a dark sector gauge boson by at least one order of magnitude [3]. [1] N. Arkani-Hamed, et al., Phys. Rev. D 79 (2009) 015014 [2] J. D. Bjorken, et al., Phys. Rev. D 80, 075018 (2009) [3] H. Merkel, et al., Phys. Rev. Lett. 106, 251802 (2011)
Date: Fri, 03.05.2013
Time: 15:30
Location:Atominstitut Hörsaal, Stadionallee 2. 1020 Wien
Contact:Hartmut Abele