Calendar of Physics Talks Vienna

Discontinuous Galerkin Methods in Nano-Photonics
Speaker:Kurt Busch (Humboldt-Universität zu Berlin)
Abstract:Discontinuous Galerkin methods facilitate efficient computations of nano-photonic systems by combining the flexibility of finite element approaches with efficient time-stepping capabilities [1]. While the former allows for an accurate representation of complex geometries, the latter requires material models that are amenable to auxiliary differential equations techniques. In this talk, the present state of Discontinuous Galerkin Time-Domain (DGTD) approaches to nano-photonic systems is reviewed (from a necessarily biased angle). This includes methodic aspects such as convergence properties of DGTD computations, multiple time-stepping algorithms [2] and material models for the magneto-optical [3] and nonlinear [4,5] properties of plasmonic systems. In addition, selected applications such as the computation of electron energy loss spectra [6,7], modified emission dynamics [8], and fluctua
Date: Mon, 11.04.2016
Time: 17:30
Duration: 60 min
Location:EI 2 Pichelmayer, Gußhausstr. 27 - 29, Vienna
Contact:www.coqus.at / Christina Becker

The commutative limit of finite spectral triples
Speaker:John Barrett (Univ. Nottingham)
Abstract:im Rahmen des Seminars für Mathematische Physik: A general formalism for commutative limits of finite spectral triples is presented, with details of examples of fuzzy spaces converging to compact manifolds.
Date: Tue, 12.04.2016
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Kleiner Seminarraum der Theor. Physik, 5. Stock Boltzmanngasse
Contact:H. Steinacker

From gauge fields to physical particles
Speaker:Reinhard Alkofer (Univ. Graz)
Abstract:im Rahmen des Teilchenphysikseminars: In this talk I will outline a program to calculate the properties of gauge-invariant physical states in quantum gauge field theories by employing functional methods. After briefly revisiting some respective non-perturbative properties of gauge theories the nature of gauge-invariant relativistic bound states of the elementary fields will be discussed. The status of currently possible calculations will be exemplified by discussing (i) the influence of the infrared properties of three-point vertex functions on mesons and (ii) nucleon properties resulting from the solution of a covariant Faddeev equation.
Date: Tue, 12.04.2016
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Hüffel

On the nodal set of solutions to spinorial equations on closed surfaces
Speaker:Volker Branding (TU Vienna)
Abstract:Im Rahmen des Literaturseminars der Gravitationsphysik: It is well known that the nodal set of solutions to semi-elliptic Dirac equations on closed Riemannian surfaces is discrete. We will derive an estimate on the nodal set of eigenspinors of the classical Dirac operator, twistor spinors, solutions to a nonlinear Dirac equation and eigenspinors of twisted Dirac operators that arise in quantum field theory. Moreover, we will point out geometric applications of our results.
Date: Thu, 14.04.2016
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien
Contact:H. Rumpf

Some New Developments in High Precision Beta Spectroscopy in Measurements of Nuclear Beta Decay
Speaker:Prof. Albert Young (Department of Physics, North Carolina State University, Raleigh USA)
Abstract:Nuclear beta decay continues to play an important role in probing the limits of validity of the standard model of particle physics, even in the era of the Large Hadron Collider (LHC). In the past five years it has become evident that constraints on "exotic couplings" with scalar and tensor symmetries (not expected in the standard model of particle physics) are possible from beta decay which can equal or exceed those expected from the LHC. These constraints arise from interference terms between standard model amplitudes and those from the exotic couplings with a characteristic 1/E dependence on the beta energy. Placing direct limits on these terms has motivated the implementation of new technology for beta spectroscopy in solenoidal magnetic spectrometers, including the development of... ( for full abstract please visit: https://indico.smi.oeaw.ac.at/event/167/ )
Date: Fri, 15.04.2016
Time: 16:00
Duration: 60 min
Location:Stefan-Meyer-Institut, Boltzmanngasse 3, 1090 Wien, Seminarraum 3-2-08 (2. Stock)
Contact:Prof. Dr. Eberhard Widmann, Dr. Martin Simon