CPT

Calendar of Physics Talks Vienna

Lectures on Topological Quantum Field Theory via Higher Category Theory
Speaker:Alessandro Valentino (Hamburg university and Max Planck Institute Bonn)
Abstract:In this series of lectures I will give an introduction to Topological Quantum Field Theories (TQFTs) as first formalized by Atiyah and Segal, namely as functors from a geometric category of cobordism to some suitable symmetric monoidal categories. More specifically, I will introduce elements of $\infty$-category theory which will allow to discuss in unified way extended theories, and in particular fully extended TQFTs. The cobordism hypothesis, which allows to completely classify fully extended theories, will be discussed as well. I will also discuss TQFTs with boundary conditions, and the relevance of the theory of module categories for 2-tier extended TQFTs on maifolds with boundaries. Finally, I will present some applications to Chern-Simons theories and Dijkgraaf-Witten theory.
Date: Mon, 20.10.2014
Time: 14:15
Duration: 90 min
Location:Erwin-Schrödinger-Institut
Contact:Nils Carqueville

Dynamical View of Quantum Thermodynamics
Speaker:Ronnie Kosloff (Hebrew University Jerusalem)
Date: Mon, 20.10.2014
Time: 17:00
Duration: 60 min
Location: Lise-Meitner Lecture Hall, 1st floor Strudelhofgasse 4, 1090 Wien
Contact:Christina Becker

Einfache quantisierte Mannigfaltigkeiten
Speaker:Sadia Schülke (Univ. Wien)
Abstract:Einige einfache quantisierte symplektische Mannigfaltigkeiten werden besprochen, insbesondere die fuzzy Sphäre und der fuzzy Torus.
Date: Tue, 21.10.2014
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Steinacker

Anomalous Hall Effect
Speaker:Pavel Středa (Institute of Physics, Academy of Sciences of the Czech Republic)
Abstract:The standard way of establishing conductivity is to use the Kubo formula or Boltzmann equation which represent the linear response of the system to the dynamical force, the electric field. Nearly no attention has been devoted to the response to the gradient of the chemical potential, which often leads to better understanding of the physical origin of the studied effect. Although procedures allowing the conductivity evaluation are quite different for such types of response, in order to comply with the general theory of irreversible processes they have to yield the same results. It will be shown that the anomalous Hall conductivity of ferromagnetic systems is fully determined by the response of the orbital momentum created by the so-called free electron currents to the chemical potential gradient. For perfect Bloch systems it coincides with the well-known formula in which the conductivity
Date: Tue, 21.10.2014
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. Josef Redinger

Introduction to General Relativity and Black Holes
Speaker:Stefan Prohazka (ITP, TU Wien)
Abstract:Part of the seminar series "Quantum Information & Quantum Gravity", loosely based on the Jerusalem lecture notes by Daniel Harlow, http://arxiv.org/abs/arXiv:1409.1231
Date: Wed, 22.10.2014
Time: 12:45
Duration: 75 min
Location:SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna)
Contact:Daniel Grumiller

Interaction Processes in Clusters of Galaxies
Speaker:Josef Stöckl (Innsbruck)
Abstract:Interaction between the components in galaxy clusters - the galaxies and the gas surrounding the galaxies, the so-called intra-cluster medium - have a variety of effects on the cluster. The gas within the galaxies is compressed and sometimes stripped off. Therefore the galaxies change their morphology and their star formation activity. The intra-cluster gas is enriched by the lost gas from the galaxies, hence it changes the metal content and the temperature. All effects are modelled by simulations on galaxy scales as well as clusters scales. Results of the evolution of various properties (metallicity, gas density, star formation rate, temperature, magnetic fields,...) are presented.
Date: Thu, 23.10.2014
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien
Contact:P.T. Chrusciel

Black holes, hidden symmetry, and complete integrability
Speaker:Valeri Frolov (Alberta U.)
Date: Thu, 23.10.2014
Time: 16:00
Duration: 60 min
Location:SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna)
Contact:Daniel Grumiller

Status of the muon anomalous magnetic moment
Speaker:Simon Eidelman (Budker Institute of Nuclear Physics and Novosibirsk State University)
Abstract:The anomalous magnetic moment of the muon is a key precision observable in particle physics and serves as a sensitive probe for physics beyond the Standard Model. A seeming experimental deviation from its predicted Standard Model value has motivated a flurry of theoretical and experimental work on the subject in the past decade. We discuss the current status of the theoretical prediction for the muon anomalous magnetic moment in Standard Model. Recent developments in estimation of hadronic vacuum polarization are described based on measurements of e+e- -> hadrons cross section in Novosibirsk and Beijing as well as those with ISR at KLOE, BaBar and Belle. We also briefly review expectations for experiment and theory in close future.
Date: Fri, 24.10.2014
Time: 10:30
Duration: 60 min
Location:Seminar Room, Wohllebengasse 12-14 (Academy building), ground floor
Contact:Josef Pradler

Transport in Heisenberg spin chains
Speaker:Christian Groß (Max Planck Institut für Quantenoptik)
Abstract:Measurements of spin diffusion in ultracold gases recently reported astonishingly small values for the diffusivity and a strong dependence on the dimensionality of the system. Furthermore, even the nature of spin transport -- ballistic or diffusive -- is an open issue in finite temperature Heisenberg quantum magnets. We report on transport measurements in Heisenberg chains realized with ultracold Bosons in two very different regimes. For week perturbations we observe ballistic transport of single as well as bound magnons. In contrast, in a far-from equilibrium situation we find effectively diffusive transport which is expected from the spectral distribution of the initial far-from equilibrium states. Repeating the latter measurement in 2D, we observe anomalous superdiffusion.
Date: Fri, 24.10.2014
Time: 15:30
Duration: 60 min
Location:Hörsaal Atominstitut, Stadionallee, Wien 2
Contact:Jörg Schmiedmayer