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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.
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| 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 |
| 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 |
| 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 |
| 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.
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| 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 |
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