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Calendar of Physics Talks Vienna
| IMPRS-APS annual meeting (24-26 November) |
| Speaker: | various (Inst., for Theoretical Physics, Max-Planck Institute for Quantum Optics, Garching) |
| Date: | Mon, 24.11.2014 |
| Time: | 09:30 |
| Location: | Austrian Academy of Sciences, Theatersaal, Sonnenfelsgasse 19, 1010 |
| Contact: | Heike Hoeller, Inst. for Theoretical Physics, 58801 13601 |
| The squashed fuzzy sphere and Landau Levels |
| Speaker: | Stefan Andronache (Univ. Wien) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik:
After reviewing the Landau problem of an electron in a magnetic field,
we discuss an analogous situation which arises on a squashed version of
the fuzzy sphere. In particular, we identify modes that can be
interpreted as string states connecting opposite sheets of the
squashed sphere subject to a magnetic flux, and establish
the relation with the Landau problem.
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| Date: | Tue, 25.11.2014 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | H. Steinacker |
| Controlling spin vortex states in magnetic nanodisks by magnetic field pulses |
| Speaker: | Michal Urbánek (Controlling spin vortex states in magnetic nanodisks by magnetic field pulses) |
| Abstract: | Magnetic vortices are curling magnetization structures formed in micro- and nanosized magnetic disks and polygons. They are known for having four different magnetization configurations (vortex states) that can be used for a multibit memory cell. The vortex states are defined by the polarity of the vortex core, pointing either up or down perpendicular to the disk plane and by the circulation of the magnetization in the plane of the disk, curling either counterclockwise or clockwise. They can be controlled by applying static out-of-plane (polarity control) or in-plane (circulation control) magnetic fields, although the amplitude of these fields is relatively large. In 2006 Van Wayenberge et al. demonstrated that the vortex polarity can be switched at much lower field amplitudes by using fast rising magnetic fields and we have recently demonstrated that a similar approach can be used for th |
| Date: | Tue, 25.11.2014 |
| Time: | 16:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Seminarraum 134A (room number DB05L03) 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Univ.Prof. Dr. Ulrike Diebold |
| Quantum field theory in black hole backgrounds (cont'd) |
| Speaker: | Friedrich Schöller (ITP, TU Wien) |
| Abstract: | Continuation of the seminar series "Quantum & Gravity", based on the Jerusalem lecture notes by Daniel Harlow, http://arxiv.org/abs/arXiv:1409.1231 |
| Date: | Wed, 26.11.2014 |
| Time: | 12:45 |
| Duration: | 75 min |
| Location: | SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna) |
| Contact: | Daniel Grumiller |
| Membranes, spectral minimal partitions. Results and problems |
| Speaker: | T. Hoffmann-Ostenhof (Vienna) |
| Abstract: | im Rahmen des Seminars in Geometric Analysis and Physics (GAP Seminar):
A survey is given of some spectral problems for membranes. In
particular minimal partitions are investigated also in relation with
classical results of Courant. Some open problems are discussed.
This is joint work with Bernard Helffer and Virginie Bonnaillie-Noel.
|
| Date: | Thu, 27.11.2014 |
| Time: | 11:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | M. Bauer (Fak. Math, U.V.), V. Branding (Fak. Math, T.U.), D. Fajman (Fak. Phys, U.V.), J. Joudioux (Fak. Phys, U.V.) |
| (Spinning) squashed extra dimensions, chiral fermions & hierarchy in N=4 super-Yang-Mills |
| Speaker: | Harold Steinacker (University of Vienna) |
| Abstract: | We explain how fuzzy geometries in extra dimensions can emerge in standard Yang-Mills gauge theory, based on a geometric version
of the Higgs effect. In particular, new solutions of SU(N) N=4 SYM interpreted as spinning self-intersecting extra dimensions are discussed. Remarkably, these backgrounds lead to a low-energy sector with 3 generations of chiral fermions coupled to scalar and gauge fields, with standard Lorentz-invariant kinematics. This sector arises from zero modes localized in the extra dimensions, which are oblivious to the background rotation at low energies. In addition there is a
sector of "heavy" excitations which is not described by a Lorentz-invariant field theory, but is argued to be suppressed at low energies assuming that resonances can be avoided. Depending on the rotation frequencies, some of the low-energy scalar fields acquire a VEV ... [abridged] |
| Date: | Thu, 27.11.2014 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna) |
| Contact: | Daniel Grumiller and Johanna Knapp |
| 10th Vienna Central European Seminar - Inflation and Cosmology |
| Speaker: | Invited speakers and junior scientists |
| Abstract: | We cordially invite you to participate in the tenth “Vienna Central European Seminar on Particle Physics and Quantum Field Theory”, which will take place at the Faculty of Physics of the University of Vienna, Boltzmanngasse 5, A-1090 Vienna, from Friday November 28 to Saturday November 29, 2014. This year “Inflation and Cosmology” has been chosen as subject. |
| Date: | Fri, 28.11.2014 |
| Time: | 09:00 |
| Location: | Christian-Doppler-HS, Uni Wien, Fakultät f. Physik, Boltzmanngasse 5, A-1090 Wien |
| Contact: | Walter Grimus, Daniel Grumiller, Andreas Ipp and Simone Krüger |
| Magnetism with and without magnetism: Different regimes of magnetic interactions in quantum gases |
| Speaker: | Klaus Sengstock (Universität Hamburg) |
| Abstract: | The talk will address different regimes of magnetic interactions in ultracold quantum gases. The spin dependent contact interaction of ultracold atoms can lead to surprising collective behavior of e.g. fermionic atoms in optical lattices and in bulk [1,2]. Recently artifcial gauge fields even allowed to study magnetic like interactions for completely non-magnetic atoms [3,4] and to simulate strong external magnetic fields which eventually allow to realize high-B-field physics like the Hofstadter butterfly. |
| Date: | Fri, 28.11.2014 |
| Time: | 15:30 |
| Location: | Hörsaal Atominstitut - Stationallee 2, 1020 Wien |
| Contact: | J. Schmiedmayer |
| Testing the Concepts of Modern Cosmology |
| Speaker: | Dominik Schwarz (Univ. of Bielefeld) |
| Abstract: | 10th Vienna Central European Seminar of Particle Physics and Quantum Field Theory: A rich resource for modern cosmology is the detailed
investigation of the microwave sky. In this public talk I will review
some of the most fundamental concepts of modern cosmology and discuss
how they are tested by means of microwave observations. Special emphasis
will be put on the concept of cosmological inflation, its predictions and
stunning consistency with current data. |
| Date: | Fri, 28.11.2014 |
| Time: | 18:30 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Christian-Doppler Hörsaal, Boltzmanngasse 5, 3. Stock |
| Contact: | Walter Grimus, Daniel Grumiller, Andreas Ipp and Simone Krüger |
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