CPT

Calendar of Physics Talks Vienna

Chiral Spirals and some issues about chiral symmetry at intermediate quark density
Speaker:Toru Kojo (Uni Bielefeld)
Abstract:After a short introduction to QCD and current issues about dense quark matter, I will explain a new state of QCD matter, Quarkyonic matter, which was recently proposed by McLerran and Pisarski. In Quarkyonic matter, quark density is so high that the quarks are released from the baryons, nevertheless excitation modes are confined. After explaining its basic concepts, I will discuss the emergence of the interweaving chiral spirals which spontaneously break the translational, rotational invariance, and the chiral symmetry near the Fermi surface. Its potential relevance to future heavy ion experiments is briefly discussed.
Date: Tue, 13.12.2011
Time: 11:45
Duration: 60 min
Location:TU Wien (Wiedner Hauptstr. 8-10), yellow area, 10th floor, seminar room E136
Contact:Sabine Ertl

Thermodynamics and electronic structure of In2O3 and ITO surfaces: Insights from first-principles calculations
Speaker:Peter Agoston (TU Darmstadt/D)
Abstract:Indium oxide is the most widely used transparent conducting oxide (TCO) especially when doped with tin (ITO). Despite its technological importance the surface properties of In2O3 are not well understood and many open questions arise from experimental studies. This presentation provides an overview on the thermodynamics and electronic structure of In2O3 and ITO surfaces. The results are based on first-principles total energy calculations. It is shown that the surface chemistry and electronic structure of low index In2O3 surfaces differs qualitatively for different surface orientations. On the basis of the properties of the (111) and (001) surfaces this finding is illustrated and discussed. The thermodynamic stability of these two surfaces is assessed as a function of the oxygen and water content in the surrounding atmosphere. In addition, the effect of doping and dopant segregation is discussed in terms of surface stability. The results obtained for In2O3 surfaces are compared not only among each other but also with the surface properties of SnO2 as well as with other group III post-transition metal oxides in the C-type rare earth modification. In addition, the relation of the surface reconstructions to the bulk point defect equilibria is pointed out.
Date: Tue, 13.12.2011
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:Univ.Prof. Dr. Ulrike Diebold

Exclusive Production of Heavy Flavours in Proton-Antiproton Collisions
Speaker:W. Schweiger (KFU Graz)
Abstract:We will discuss the reaction proton-antiproton going into hadron-antihadron for the case that the hadron contains a heavy (c or b) quark. Since the mass of the heavy quark can be taken as a hard scale, QCD perturbation theory becomes applicable at experimentally accessible energies and momentum transfers. We will present the analysis of this kind of reactions in terms of generalized parton distributions. By modeling the generalized parton distributions as an overlap of light-cone wave functions for the incoming proton and the outgoing hadron we are able to make predictions for transition form factors and (polarized) cross sections. We will show numerical results for the production of charmed Lambda-Antilambda pairs. Polarization observables exhibit patterns characteristic for a perturbative approach. Our predictions will be compared with those from other descriptions that are based on th
Date: Wed, 14.12.2011
Time: 14:00
Duration: 60 min
Location:Stefan Meyer Institute for subatomic physics, Boltzmanngasse 3, 1090, Raum 2.08
Contact:Fiona Boes, 01 4277 29701

A Modified Semi-Classical Approach to Nonlinear Quantum Oscillations Problems
Speaker:Vincent Moncrief (Yale Univ.)
Abstract:im Rahmen des Literaturseminars
Date: Thu, 15.12.2011
Time: 14:15
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock
Contact:P. Chrusciel und R. Beig

Collider Physics and Higher Order Corrections
Speaker:Gudrun HEINRICH (MPI München)
Abstract:im Rahmen des Teilchenphysikseminar
Date: Thu, 15.12.2011
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien
Contact:A. Hoang, H. Neufeld

Causal horizons and black hole formation in the early Universe
Speaker:Ilia Musco (University of Oslo)
Abstract:We present first a discussion of causal horizons, both for black holes and for the universe, emphasizing the similarities between the two situations. The discussion uses spherical symmetry but does not assume that the black holes are stationary or surrounded by vacuum, or that the universe is homogeneous. We then discuss issues concerned with cosmological structure formation in the early universe, showing results from recent simulations of Primordial Black Hole formation. In this context a key feature is the phenomenon of critical collapse: before the black hole is actually formed, there is a close balance between gravity and pressure which gives rise to an intermediate state well-approximated by a self-similar solution realized only within the past light cone of the forming black hole. The masses of the black holes finally formed follow a scaling law with respect to the amount by which the amplitude of the initial perturbation exceeds a critical threshold.
Date: Thu, 15.12.2011
Time: 16:00
Duration: 60 min
Location:SEM 136 (Freihaus, Wiedner Hauptstrasse 8-10), Institute for Theoretical Physics, Vienna University of Technology
Contact:Daniel Grumiller

Numerical finder of isometric embeddings of S2 surfaces in R3 with applications to relativity”
Speaker:Mikolaj Korzynski (Univ.Wien)
Date: Fri, 16.12.2011
Time: 13:00
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Währinger Strasse 17, Teeraum A, 1. Stock
Contact:P. Chrusciel

Reasoning about cellular diversity within a sequentially linear regulatory network model
Speaker:Manuel Schölling (Medzin.Univ.Wien)
Abstract:im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische Systeme"(Univ.Wien) und "Analyse Komplexer Systeme" (Medizinische Univ. Wien)
Date: Fri, 16.12.2011
Time: 14:00
Duration: 90 min
Location:Medizinische Univ., Bauteil 88,
Contact:H. Hüffel, Stefan Thurner