|
Calendar of Physics Talks Vienna
| Topological defects in open string field theory |
| Speaker: | Prof. Martin Schnabl (Univ. Prag) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik |
| Date: | Tue, 19.06.2018 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, D. Grumiller |
| Gravitational waves in deSitter background |
| Speaker: | Jahanur Hoque (Chennai) |
| Abstract: | Cosmological observations have established that our universe has positive cosmological constant. A positive cosmological constant profoundly alters the asymptotic structure of space-time. In this talk, we discuss the linearized gravitational field produced by compact sources in the background with positive cosmological constant -- de Sitter space. Using the covariant phase space formalism, we obtain the quadrupole formula in such a setting. We also show that the energy flux of gravitational waves measured at future null infinity is the same as that measured across the cosmological horizon of the compact source. To get an order of estimate we also discuss power radiated by a binary system in de Sitter background. |
| Date: | Thu, 21.06.2018 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel, D. Fajman |
| Finite coupling corrections to gauge fields in AdS/CFT |
| Speaker: | Sebastian Waeber (Uni Regensburg) |
| Abstract: | We compute finite 't Hooft coupling corrections to observables related to charged quantities in strongly coupled N=4 supersymmetric Yang-Mills plasma. The coupling corrected equations of motion of gauge fields are explicitly derived and differ from findings of previous works, which contained several small errors with large impact. As a consequence the O(γ)-corrections to the observables considered, including the conductivity, quasinormal mode frequencies, in and off equilibrium spectral density and photoemission rates, become much smaller. This suggests that infinite coupling results obtained within AdS/CFT are little modified for the real QCD coupling strength. |
| Date: | Thu, 21.06.2018 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | SEM136, Wiedner Hauptstr. 8-10, 10th floor (yellow), 1040 |
| Contact: | Anton Rebhan |
| Silicon Technologies for Future Collider Experiments |
| Speaker: | Florian Pitters (CERN) |
| Abstract: | Over the past 30 years, silicon as a detector material has steadily increased in importance for high energy physics. For future detectors, this trend seems to continue if not accelerate.
For CLIC, a future 3 TeV e+e- collider, the desired energy and momentum resolution together with the flavour tagging performance will require the vertex detector to provide around 3 µm spatial and 3 ns time resolution [..]. Several technologies [..] are currently under consideration to fulfill these requirements.
For the HL-LHC phase, the CMS endcap calorimeter upgrade will employ more than 600 m2 of silicon pad sensors. [..] precise timing capabilities and unprecedented radiation hardness is needed.
The role of silicon detectors in these two future collider experiments with very different experimental and technological challenges will be discussed.. [full abstract https://indico.smi.oeaw.ac.at/event272] |
| Date: | Thu, 21.06.2018 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Stefan-Meyer-Institut, Boltzmanngasse 3, 1090 Wien, Seminarraum 3-2-08 (2. Stock) |
| Contact: | Prof. Dr. Eberhard Widmann, Dr. Martin Simon |
|