|
Calendar of Physics Talks Vienna
| Scalar and other mesons in vacuum |
| Speaker: | Denis Parganlija (Vienna University of Technology) |
| Abstract: | Scalar mesons have been one of the most hotly debated issues of
low-energy QCD for decades. Experimental data show the existence of six
scalar isosinglet states -- next to the famous sigma meson, there are five
states with the same quantum numbers but higher energies than the energy
of the sigma. If we consider the u and d quarks as degenerate and work in
a theoretical framework that inlcudes strange states as well, then we can
construct two scalar \bar q - q states. Thus constructed scalars can, of
course, describe at most two out of the mentioned six experimentally known
states - but the question is: Which two? I will present a model with
(pseudo)scalar and (axial-)vector mesons that allows us to pursue an
answer to this question. Order parameters with scalar (and other) mesons
for the chiral transition will also be briefly discussed. |
| Date: | Tue, 06.03.2012 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room |
| Contact: | Vienna Theory Lunch Seminar (http://www.univie.ac.at/lunch-seminar/index.htm) |
| Characterization of Non-Equilibrium Atmospheric Pressure Plasma Jets |
| Speaker: | Dr. Qurat Ul Ain (Technische Universität Wien, Institut für Angewandte Physik) |
| Abstract: | Low temperature atmospheric pressure plasmas are a comparatively new type of plasma with scientific, technological and economic impact in many scientific disciplines and various fields of application. They can be generated by a variety of techniques; one of them is the atmospheric pressure plasma jet (APPJ), which features a radio‐frequency (RF) discharge between bare metallic electrodes. Usually APPJ is operated in the alpha mode at gap spacings in the range of 1 mm or even more. This seminar highlights research efforts of the two APPJs (APPJ2, APPJ3) with different sizes exploring gap sizes in the range of 1 mm down to 100 µm; the electrode area of the device APPJ3 is half than the area of APPJ2, and both are sandwiched structures. The RF capacitive coupled discharges were fundamentally characterized in helium thereof by voltage‐current measurements, macroscopic visualization and manipulation of the discharges and extensive spectroscopic measurements. |
| Date: | Tue, 06.03.2012 |
| 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 |
| Mission to Mars – Why is Mars not a blue planet? |
| Speaker: | Prof. Dr. Franz Renz |
| Abstract: | Since ages, the red planet Mars is a source of inspiration and a target for scientific interests. Currently the Mars is under experimental
investigation, among them are the NASA Mars Exploration Rovers Spirit and Opportunity. Recent iron chemical results indicate that Mars
was a blue planet but why is he not anymore? This and more scientific results from Mars will be discussed and its capability as a reference
model for our planet earth. This shed light on, where we are coming from and going to. |
| Date: | Tue, 06.03.2012 |
| Time: | 17:30 |
| Duration: | 60 min |
| Location: | Lise-Meitner Hörsaal, Universität Wien, 1090 Wien, Strudlhofgasse 4 / Boltzmanngasse 5, 1.Stock |
| Contact: | christl.langstadlinger@univie.ac.at |
| "(Weak) solutions of (generalized) fluids" |
| Speaker: | Robert Beig (Fakultät für Physik) |
| Abstract: | im Rahmen des Literaturseminars |
| Date: | Thu, 08.03.2012 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock |
| Contact: | R. Beig |
| On the 100th anniversary of the Sackur - Tetrode equation |
| Speaker: | Walter Grimus (Fakultät für Physik) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Thu, 08.03.2012 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | H. Neufeld |
| RG analysis on chiral symmetry in a strong magnetic field |
| Speaker: | Kenji Fukushima (Keio University) |
| Abstract: | A strong magnetic field enhances the chiral condensate,
which is known as the Magnetic Catalysis. In a chiral model
the Magnetic Catalysis results from a simple mean-field
calculation. In this talk I will explain how to understand this
phenomenon in terms of the RG flow of the four-point
vertex. In this way it will also become evident that medium
effects such as finite temperature and density significantly
weaken the Magnetic Catalysis. Finally I will discuss meson
effects including some speculative ideas.
|
| Date: | Thu, 08.03.2012 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | Institut f. Theoret. Physik, TU Wien, SEM 136, Wiedner Hauptstr., 10th floor |
| Contact: | Anton Rebhan (TU Wien) |
| Yang-Mills thermodynamics from the Gribov horizon |
| Speaker: | Nan Su (Univ. Bielefeld) |
| Abstract: | In this talk I will report the motivation and progress of a 1-loop calculation of Yang-Mills thermodynamic potential using the Gribov-Zwanziger framework which cuts off the Gribov horizon in the gauge fixing. The Gribov mass parameter can be solved self-consistently via a nonperturbative horizon condition and the result turns out to be of the order g^2T, i.e. the same order as the magnetic scale. As a consequence the 1-loop thermodynamic potential already contains contributions from the nonperturbative magnetic scale. Different from the conventional Faddeev-Popov gauge fixing case where the vacuum part is discarded in the normalization, there are scale dependent divergences coming from the vacuum part which have to be regularized. The Gribov-Zwanziger framework may provide a perturbative scheme which is able to incorporate (part of) the nonperturbative magnetic contributions.
|
| Date: | Fri, 09.03.2012 |
| Time: | 11:00 |
| Duration: | 60 min |
| Location: | Institut f. Theoret. Physik, TU Wien, SEM 136, Wiedner Hauptstr., 10th floor |
| Contact: | Anton Rebhan (TU Wien) |
|