
Calendar of Physics Talks Vienna
Spinorbit interactions of light 
Speaker:  Konstantin Bliokh 
Abstract:  I will give an overview of the fine spinorbit phenomena which appear in evolution of polarized light and optical vortex beams at subwavelength scale. These are spin and orbital Hall effects, spintoorbitangular momentum conversion, etc. Interference of partial waves gaining geometricphase gradients underlies these phenomena and provides their “wave” description. At the same time, conservation and dynamics of the angularmomentum degrees of freedom of light provides a “particle” picture of the spinorbit interactions. The spinorbit effects appear in most of the basic optical processes (such as interference, diffraction, scattering, focusing, reflection, etc), and are of a great importance for modern nanooptics. 
Date:  Tue, 09.09.2014 
Time:  16:00 
Duration:  90 min 
Location:  Seminarraum Atominstitut 
Contact:  Arno Rauschenbeutel  Philipp Schneeweiß 
New Methods for Gauge Theories 
Speaker:  Thomas Strobl (Lyon U.) 
Abstract:  The established method for the construction or understanding of gauge theories consist in the gauging of a rigid symmetry group where for each
symmetry parameter one extends the original functional by one appropriate gauge field. We introduce drastically new alternatives to this:
1. Often it is sufficient to introduce a smaller number of gauge fields only; this permits to gauge some infinitedimensional rigid symmetries
with a finite number of gauge fields.
2. The condition of a rigid symmetry can be relaxed in the sense of making it change from point to point, permitting to gauge also rigid Lie
groupoid symmetries
3. There are situation where one can gauge even in the absence of a symmetry.
We attempt to keep the presentation rather elementary, assuming only some basic knowledge of differential geometry.

Date:  Wed, 10.09.2014 
Time:  10:30 
Duration:  60 min 
Location:  SEM 136 (Freihaus, Wiedner Hauptstrasse 810), Institute for Theoretical Physics, Vienna University of Technology 
Contact:  Daniel Grumiller 
