Calendar of Physics Talks Vienna

Civil engineering mechanics – development and latest trends
Speaker:Prof. Dr. Christian Hellmich (TU Wien, Institute for Mechanics of Materials and Structures)
Abstract:Engineering mechanics has its root in the 18th century, when Euler extended the Newtonian single forces to volume force densities, and was later extended to its full technological maturity by Cauchy, who in the early 19th century introduced the concept of surface force densities, also called mechanical stress. This has boosted continuum mechanics as the backbone of the industrial revolution in structural engineering - with the Eiffel tower as its pre-eminent epitome. Since the 1970s, a novel type of continuum mechanics theories have been developed, which, rather than building large structures from centimeter-scaled elementary volumes (of steel, concrete etc.), allow for learning about the mechanical interactions of the matter found WITHIN the aforementioned volumes. This has added a fundamentally new dimension to the field called material science. Such micromechanical or multiscale mec
Date: Tue, 19.04.2016
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Sem.R. DB gelb 05 B (room number DB05L03) 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Univ.Prof. Dr. Ulrike Diebold

Speaker:Corcella Gennaro (INFN, Frascati)
Abstract:Im Rahmen des Teilchenphysikseminars: For the sake of performing precise measurements of the top-quark properties, such as its mass, a reliable description of bottom-quark fragmentation in top decays is fundamental. I will discuss the available tools to address b-fragmentation in top decays, namely resummed calculations, based on the perturbative-fragmentation formalism, and parton-shower simulations. The inclusion of non-perturbative corrections will also be debated and the impact on the uncertainty on the top-mass reconstruction in a few analyses will be investigated as well.
Date: Tue, 19.04.2016
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, Y. Wang

Understanding unconventional superconductivity and Majorana physics in topological insulators
Speaker:Grigory Tkachov (Universität Würzburg)
Abstract:Topological phases of matter are encountered in many areas of physics, from relativistic quantum field theory to solid state physics. Recent interest in topological phenomena has been boosted by the discovery of topological insulators (TIs) - electronic materials behaving as an insulator in their interior, while conducting at the surface. This talk will survey some unconventional properties of hybrid structures comprising TIs and superconductors [1-5]. Their distinctive feature is the broken spin rotation symmetry due to the helical spin polarization of the TI surface or edge states. To illustrate this point, several examples will be discussed at a general-audience level, including the surface p-wave superconductivity, topological Andreev bound states and Majorana zero modes in the quantum spin-Hall channels.
Date: Wed, 20.04.2016
Time: 16:00
Duration: 45 min
Location:Seminarraum DC rot 07 (roter Bereich, 7. OG), Wiedner Hauptstraße 8-10, 1040 Wien
Contact:Andrei Pimenov

Large deviations, optimal transport and Newtonian gravitation
Speaker:Yann Brenier (CNRS, CMLS, Ecole Polytechnique, Palaiseau, France)
Abstract:im Rahmen des Literaturseminars der Gravitationsphysik: The Vlasov-Monge-Ampere model, based on optimal transport ideas, is an approximate model for classical (Newtonian) gravitation, closely related to the Zeldovich model in Cosmology. A derivation will be proposed, based on a double application of large deviation principles, from the very elementary stochastic model of a brownian point cloud without interactions.
Date: Thu, 21.04.2016
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien
Contact:H. Rumpf