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.
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