Calendar of Physics Talks Vienna

Correlation functions of 1D Bose gases: from weak to strong interaction - 1st part
Speaker:Dr Isabelle Bouchoule (Institut d'Optique, Palaiseau, France)
Abstract:Among the systems of many-body physics, one-dimensional Bose gases attract a lot of interest since a deep understanding of the physics is possible and fascinating behaviors occur such as the fermionisation of the gas for strong interactions. In the past few years, many cold atoms experiments investigated such systems and several important results were reported both in weak interaction regime and in the strong interaction regime. In this lecture, we will give an overview of the properties of 1D Bose gases. We will identify the different asymptotic regimes. In each regime, we will discuss correlation functions, which are quantities that describe the gas properties and which are explored experimentally. A special focus will be put on the so-called "quasi-condensate regime": after introducing the Bogoliubov theory, we will show how it enables the calculation of correlation function. Results of experiments will be commented.
Date: Mon, 20.06.2011
Time: 14:00
Duration: 90 min
Location:Seminar room, Institute of Atomic and Subatomic Physics, Stadionallee 2, 1020 Vienna
Contact:Dr Thorsten Schumm

Generating particle-like scattering states in wave transport
Speaker:Prof. Stefan Rotter (TU Wien)
Abstract:I will speak about our recent work on scattering states which display trajectory-like wave function patterns in wave transport through complex systems [1]. These beam-like scattering states feature the dual property of having a well-defined scattering delay time and deterministic transmission close to 0 or 100%. An operational protocol for generating these states is put forward which is based solely on a system's scattering matrix and which we implemented numerically for ballistic and disordered scattering landscapes. I will conclude by a discussion of envisioned realizations of our ideas with electromagnetic, acoustic or matter waves with possible applications like wave focusing and secure/low-power communication [2]. [1] S. Rotter, P. Ambichl, and F. Libisch, Phys. Rev. Lett. 106, 120602 (2011). [2] Physical Review Focus, April issue (2011).
Date: Mon, 20.06.2011
Time: 14:30
Duration: 45 min
Location:Freihaus Semraum 138B
Contact:Prof. Karsten Held

Positron emission tomography - An Indroduction
Speaker:Albert Hirtl (MedUni Wien)
Abstract:Positron emission tomography (PET) has proven to be a very useful diagnostic and research tool in nuclear medicine. It provides the possibility to visualise physiological processes (e. g., tumour metabolism) in vivo with high spatial resolution. With the construction of PET-CT systems, which are[..]
Date: Mon, 20.06.2011
Time: 16:00
Duration: 60 min
Location:SMI, Seminar room, Boltzmanngasse 3, 1090 Wien, Room 2.08
Contact:Roland Gsell

Quark Matter and Neutron Stars
Speaker:Mark Alford (Washington University in St Louis)
Date: Mon, 20.06.2011
Time: 16:15
Duration: 60 min
Location:Institute for Theoretical Physics, TU Wien, SEM 136, 10th floor, Wiedner Hauptstr. 8-10, 1040 Wien
Contact:Andreas Schmitt

Vienna Theory Lunch Seminar - Black Hole Microstates
Speaker:Andrea Puhm (CEA-Saclay Paris)
Abstract:A century after the first black hole solution to Einstein's equation was found black holes remain an intense and puzzling area of research. While general relativity is a very good description far away from the black hole horizon quantum mechanical effects like Hawking radiation are present close to the horizon leading to apparent inconsistencies like information loss. A theory of quantum gravity is needed in order to describe black holes in full glory and to resolve these puzzles. In this talk I will introduce how black holes can be described in string theory and how ''black hole microstates'' may cure these paradoxes. Constructing such microstates is a difficult task and so far they have been found only for extremal (supersymmetric and non-supersymmetric) black holes.
Schedule Overview
Date: Tue, 21.06.2011
Time: 12:30
Duration: 60 min
Location:SEM 136 (Freihaus, Wiedner Hauptstrasse 8-10), Institute for Theoretical Physics, Vienna University of Technology
Contact:Sabine Ertl

Pointlike localized observables for infinite spin Wigner representations
Speaker:Christian Köhler (Univ.Wien)
Abstract:im Rahmen des Seminars für Mathematische Physik
Date: Tue, 21.06.2011
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien
Contact:J. Yngvason

Energy transport mechanisms in multi-layer insulations under vacuum
Speaker:Dr. Gerald Richter (Technische Universität Wien, Institut für Angewandte Physik)
Abstract:Multi-layer insulations (MLIs) that have long been used in space and terrestrial applications were mostly designed by using an "empirical black-box approach". In the course of the "Ultimal" research project some unexpected behavior became evident when MLI material configurations were examined over a broader temperature range. In this talk the ongoing efforts to explain the experimental data by a pyhsical model will be presented including preliminary results.
Date: Tue, 21.06.2011
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134A, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Ao.Univ.Prof. Dr. Wolfgang Werner

Quantum interferometric visibility as a witness of general relativistic proper time
Speaker:Prof. Caslav Brukner (Wien)
Date: Wed, 22.06.2011
Time: 16:00
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock
Contact:P. Chrusciel und R. Beig