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Calendar of Physics Talks Vienna
| Quantum field theory in deSitter spacetime |
| Speaker: | Prof. Stefan Hollands (Universität Leipzig) |
| Abstract: | In this talk, I review properties of the so-called "deSitter
spacetime", and some properties of quantum field theories
that live on this spacetime. The investigation of such theories is
highly relevant to cosmology, because deSitter space
is thought to describe the earliest epoch of our universe, at least to
some approximation. It is also interesting from a
Mathematical viewpoint, because deSitter space is a space with maximal
symmetry, making possible several explicit
constructions and investigations that would be out of reach in quantum
field theories on more general Lorentzian manifolds. |
| Date: | Mon, 27.04.2015 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| Why the eclipse of the sun is a danger for our electricity supply |
| Speaker: | Dr. Gerhard Lakits, Dr. Katharina Igenbergs-Satlow (Energy Management Applications / Siemens AG Austria) |
| Abstract: | The eclipse of the sun is one example for extreme effects coming from renewable generation on the stability of electrical grids. This and other effects will be presented by the authors together with modern tools making the electrical grids ‘smart’. |
| Date: | Tue, 28.04.2015 |
| 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. Friedrich Aumayr |
| Glauber Gluons and Multiple Parton Interactions |
| Speaker: | Jonathan Gaunt (DESY, Hamburg) |
| Abstract: | im Rahmen des Teilchenphysikseminars:I will discuss two pieces of work related to Glauber modes and multiple parton interactions (MPI):
1) I will show that for certain 'MPI sensitive' observables, such as
hadronic transverse E_T, the standard factorisation formula with hard, collinear and soft functions fails to completely describe the
leading power behaviour. I will show that this breakdown in the standard
factorisation occurs at the level of two Glauber gluons exchanged between spectators, and discuss the connection between these noncancelled Glauber exchanges and soft MPI. [Based on JHEP 1407 (2014) 110]. 2) I will discuss the role of Glauber exchanges in hard double parton scattering (DPS). I will demonstrate the cancellation of Glauber
modes in the double Drell-Yan process, using similar methodology as was used by Collins, Soper and Sterman for single Drell-Yan |
| Date: | Tue, 28.04.2015 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| Superfluidity versus Bose Einstein Condensation |
| Speaker: | Jakob Yngvason (Univ. Wien) |
| Abstract: | Joint Theoretical Physics Seminar: The two concepts in the title stand for two distinct quantum phenomena whose relation
to one another is not obvious although they often occur together. Moreover, there is not
a unique concept of superfluidity. In the talk I shall first comment on these general issues
and then discuss a simple model involving a tunable random potential where some precise
statements can be rigorously proved. The latter is joint work with M.Könenberg, T. Moser
and R. Seiringer.
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| Date: | Thu, 30.04.2015 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
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