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Calendar of Physics Talks Vienna
| Loop functions in thermal QCD |
| Speaker: | Antonio Vairo (TU München) |
| Abstract: | im Rahmen des Teilchenphysikseminars: We present recent computations of loop functions in thermal QCD like
the Polyakov loop, the Polyakov loop correlator and the cyclic Wilson loop.
We discuss divergences and how to renormalize them. Finally we compare
with lattice data.
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| Date: | Tue, 21.06.2016 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, Y. Wang |
| Speaker: | Markus Aspelmeyer (Univ. Wien) |
| Abstract: | This is an overview talk on the topic. It starts with the early pioneering experiments by Pound and Rebka and by Colella, Overhauser and Werner that demonstrate the effect of the gravitational potential on the frequency of a photon and on quantum interference fringes in a neutron interferometer, respectively.
The latter represents the first experiment that required the use of both Planck’s constant and Newton’s constant (via earth’s acceleration g) to describe the observed interference fringes. Over the following decades, modern quantum physics added new tools and allowed to significantly expand the available quantum experiments that test the effects of weak gravitational fields, including atomic fountains (pioneered by Kasevich and Chu), lab-¬‐based atomic clock tests of the gravitational red shift or the demonstration of gravitationally bound states of cold neutrons. . . . . . |
| Date: | Thu, 23.06.2016 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| Smooth conformal Einstein-lambda-dust flows across time-like infinity |
| Speaker: | Helmut Friedrich (MPI Golm) |
| Abstract: | We consider the Einstein-dust equations with positive cosmological constant $\lambda$ onmanifolds with time slices diffeomorphic to an orientable, compact 3-manifold $S$.
It is shown that the set of standard Cauchy data for the Einstein-$\lambda$-dust equations
on $S$ contains an open (in terms of suitable Sobolev norms) subset of data which develop into solutions that admit at future time-like infinity a space-like conformal boundary ${\cal J}^+$ that is $C^{\infty}$ if the data are of class $C^{\infty}$ and of correspondingly lower smoothness otherwise. The class of solutions considered here comprises non-linear perturbations of FLRW solutions as very special cases. It can conveniently be characterized
in terms of asymptotic end data induced on ${\cal J}^+$. These data must only satisfy a linear differential equation. .... |
| Date: | Thu, 23.06.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| Non-relativistic limits of relativistic (super-)gravity |
| Speaker: | Jan Rosseel (U. Bern) |
| Date: | Thu, 23.06.2016 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna) |
| Contact: | Daniel Grumiller |
| How far we have advanced from the Abrikosov vortices |
| Speaker: | Prof. Mikhail A. Shifman (Univ. of Minnesota) |
| Abstract: | In the early 1950s, Alexei Abrikosov predicted superconductors of the second kind
and demonstrated that external magnetic fields should generate vortices (magnetic flux
tubes) in the bulk of the superconducting sample. This was the first example of
topological solitons in quantum field theory. In the mid-1970s, Nambu, 't Hooft and
Mandelstam conjectured that the dual Meissner effect and formation of chromoelectric
vortex lines were resonsible for quark (color) confinement at strong coupling.
The second coming of the topological vortex strings occurred with the advancement
of supersymmetry.
In 1994 Seiberg and Witten analytically proved the dual Meissner effect in a
supersymmetric Yang-Mills theory with parallels in QCD.
In 2003 the so-called non-Abelian vortex flux tubes were constructed, also in a
supersymmetric setting. . . . . . |
| Date: | Fri, 24.06.2016 |
| Time: | 16:15 |
| Duration: | 90 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | G. Ecker, A. Hoang, H. Neufeld |
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