
Calendar of Physics Talks Vienna
IMPRSAPS annual meeting (2426 November) 
Speaker:  various (Inst., for Theoretical Physics, MaxPlanck 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, ErwinSchrödingerHörsaal, 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 outofplane (polarity control) or inplane (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 810 
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. 810, A1040 Vienna) 
Contact:  Daniel Grumiller 
Membranes, spectral minimal partitions. Results and problems 
Speaker:  T. HoffmannOstenhof (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 BonnaillieNoel.

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 superYangMills 
Speaker:  Harold Steinacker (University of Vienna) 
Abstract:  We explain how fuzzy geometries in extra dimensions can emerge in standard YangMills gauge theory, based on a geometric version
of the Higgs effect. In particular, new solutions of SU(N) N=4 SYM interpreted as spinning selfintersecting extra dimensions are discussed. Remarkably, these backgrounds lead to a lowenergy sector with 3 generations of chiral fermions coupled to scalar and gauge fields, with standard Lorentzinvariant 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 Lorentzinvariant 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 lowenergy 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. 810, A1040 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, A1090 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:  ChristianDopplerHS, Uni Wien, Fakultät f. Physik, Boltzmanngasse 5, A1090 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 nonmagnetic atoms [3,4] and to simulate strong external magnetic fields which eventually allow to realize highBfield 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, ChristianDoppler Hörsaal, Boltzmanngasse 5, 3. Stock 
Contact:  Walter Grimus, Daniel Grumiller, Andreas Ipp and Simone Krüger 
