Calendar of Physics Talks Vienna

A Mass-Angular Momentum-Charge Inequality for Multiple Black Holes, Size-Angular Momentum-Charge Inequalities for Bodies, and Existence of Black Holes
Speaker:Marcus Khuri (Stony Brook)
Abstract:Lunchseminar: In the first part of the talk we present a proof of the mass-angular momentum-charge inequality for multiple black holes (joint with Gilbert Weinstein). In the second part, new inequalities relating the size and angular momentum as well as size and charge of bodies is presented. Lastly, black hole existence results due to concentration of angular momentum and charge will be discussed.
Date: Mon, 15.06.2015
Time: 13:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, common room, 1. Stock
Contact:P.T. Chrusciel

Proton distribution and transfer dynamics at the solid/liquid interface
Speaker:Prof. Dr. Bernd Meyer (Friedrich-Alexander-Universität Erlangen-Nürnberg/Germany)
Abstract:Car-Parrinello Molecular Dynamics (CPMD) simulations have been pivotal in advancing our understanding of proton transport in hydrogen-bonded bulk liquids on the molecular scale. Two examples will be discussed which demonstrate that the bulk proton dynamics can change significantly in spatially confined liquids and at solid/liquid interfaces. The first example will be water in contact with hydroxylated oxide surfaces. We find that the energetic hierarchy of preferred protonation sites and the proton distribution on the surface depend on the environment and change from the vacuum to thin water films and the full solid/liquid interface. The surfaces readily deprotonate in the CPMD simulations due to their inherent acidity and the protons are redistributed by surface assisted and water-mediated transfer events. In the second example we studied the proton diffusion in sulfuric acid confined b
Date: Tue, 16.06.2015
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:Univ.Prof. Dr. Ulrike Diebold

(Accurate) Predictions for New Strong Dynamics at the LHC
Speaker:Diogo Buarque Franzosi (Southern Denmark Univ., CP3-Origins)
Abstract:Despite the common lore, dynamical electroweak symmetry breaking can feature a light scalar with couplings similar to the SM Higgs boson. In this talk I will revise some points that make new strong dynamics a promising possibility. Then I will discuss some phenomenology for the LHC,Drell-Yan production and the complementarity of weak boson scattering. In this class of models, also heavier and broad resonances are expected to appear, and the correct treatment of width effects in this kind of state is always prone to discussion. I will present a scheme to treat broad unstable particles based on effective operators which can account for running width effects in a gauge invariant fashion. Finally, also modifications on interactions beyond EWPO are expected. I will present thecomputation of top quark chromomagnetic moment in top pair production at NLO in QCD which can naturally appear
Date: Tue, 16.06.2015
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, H. Neufeld

Interaction of light and interfacial fluids: from the microwave to organic solar cells
Speaker:Prof. Dr. Stephan Gekle (Biofluid Simulation and Modeling, Universität Bayreuth, Deutschland)
Date: Tue, 16.06.2015
Time: 17:30
Duration: 60 min
Location:Lise-Meitner-Hörsaal, Fakultät für Physik, Universität Wien, 1090 Wien, Strudlhofgasse 4 / Boltzmanngasse 5, 1. Stock

Quiver gauge theories and integrable lattice models
Speaker:Junya Yagi (SISSA)
Abstract:I will discuss connections among supersymmetric quiver gauge theories, topological quantum field theories (TQFTs), and integrable lattice models in statistical mechanics. This work combines ideas from (1) the correspondence between class-S theories and TQFTs; (2) "gauge/YBE correspondence" between N=1 supersymmetric indices and solutions of the Yang-Baxter equation; and (3) Costello's construction of integrable lattice models from TQFTs equipped with line operators.
Date: Wed, 17.06.2015
Time: 16:15
Duration: 60 min
Location:ESI, kleiner Hörsaal
Contact:Nils Carqueville

Mapping spaces in supergeometry and applications in geometry and physics
Speaker:Florian Hanisch (Potsdam University)
Abstract:Supergeometry is the geometry of spaces whose rings of functions contain commuting as well as anticommuting elements; they thus allow for a description of "classical" physical systems containing bosonic as well as fermionic degrees of freedom. After a short introduction to different approaches to the subject, we will discuss the construction of "mapping space"-objects and some problems resulting from non-compact domains (which are particularly relevant for physical applications). We will then explain how the framework can be used to describe spaces of solutions to PDEs for "classical" fermionic quantities. Spaces of this type arise in geometrical and physical applications, we will briefly describe the construction of the (infinite-dim.) phase space associated to a simple fermionic field theory.
Date: Thu, 18.06.2015
Time: 11:00
Duration: 60 min
Location:University of Vienna, Department of Mathematics, Besprechungszimmer 2nd floor
Contact:Volker Branding

Quantum systems as spacetime probes
Speaker:Ivette Fuentes (Vienna)
Abstract:Hawking radiation and particle creation by an expanding Universe are paradigmatic predictions of quantum field theory in curved spacetime. Although the theory is a few decades old, it still awaits experimental demonstration. At first sight, the effects predicted by the theory are too small to be measured in the laboratory. Therefore, current experimental efforts have been directed towards siumlating Hawking radiation and studying quantum particle creation in analogue spacetimes. In this talk, I will present a proposal to test directly effects of quantum field theory in the Earth's spacetime using quantum technologies. Under certain circumstances, real spacetime distortions (such as gravitational waves) can produce observable effects in the state of phonons of a Bose-Einstein condensate. The sensitivity of the phononic field to the underlying spacetime can also be used ....
Date: Thu, 18.06.2015
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien
Contact:P.T. Chrusciel

Nonassociative star products
Speaker:Dmitri Vassilevich (ABC Federal U. )
Abstract:Star product is a formal deformation of the point-wise product of smooth functions on some manifold. In the classical setting, the Poisson bracket serves as an initial conditions, while the associativity allows to proceed to higher orders. Some applications to string theory require deformation in the direction of a quasi-Poisson bracket (that does not satisfy the Jacobi identity). This initial conditions is incompatible with associativity, it is quite unclear which restrictions can be imposed on the deformation. We show that for any quasi-Poisson bracket the star product exists and is essentially unique if one requires hermiticity and the Weyl condition.
Date: Thu, 18.06.2015
Time: 16:00
Duration: 60 min
Location:SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna)
Contact:Daniel Grumiller and Johanna Knapp