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Calendar of Physics Talks Vienna
| Vacuum energy at different scales |
| Speaker: | Dr. René Sedmik (Vrije Universiteit Amsterdam, Institute of Exact Sciences) |
| Abstract: | Casimir/van der Waals forces are manifestations of vacuum energy at small separations that share a long history of both theoretical and experimental investigation. Motivation for these efforts comes not only from fundamental science but also from technology, since in micro- and nano-mechanical applications featuring ever decreasing surface separations, the attraction between small objects is a nuisance cumbering designers and engineers. Several experimental and theoretical approaches have been suggested to reduce or utilize Casimir forces but experimental data on new geometric configurations are required to verify them.
At much larger separations, astronomical observations indicate that there exists a pervasive omnipresent form of 'dark energy' that drives the accelerated expansion of the universe. While physical intuition...
[full abstract at https://indico.smi.oeaw.ac.at/event/208] |
| Date: | Wed, 02.11.2016 |
| 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 |
| Anti-gravity a la Carlotto-Schoen |
| Speaker: | Piotr T. Chrusciel (Univ. Vienna) |
| Abstract: | im Rahmen des Literaturseminars der Gravitationsphysik:
After an introduction to gluing constructions for initial data in theories with constraints, I will describe the Carlotto-Schoen gluing
construction, which allows to screen away gravitation using the
gravitational field.
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| Date: | Thu, 03.11.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| THE COSMICS LEAVING OUTDOOR DROPLETS EXPERIMENT |
| Speaker: | PAUL M . WINKLER (University of Vienna) |
| Abstract: | The formation of nanoparticles from gaseous precursors is frequently observed in the global atmosphere. Model estimates suggest that new particle formation contributes roughly 50% of aerosol particles to the budget of cloud condensation nuclei. New particle formation is thus considered an important mechanism affecting the indirect aerosol radiative forcing of global climate. The Cosmics Leaving OUtdoor Droplets (CLOUD) experiment aims at the identification and quantification of physico-chemical mechanisms leading to new particle formation under precisly controlled chamber conditions. Experiments are performed at the CLOUD chamber, a 26 m³ stainless steel tank located at the CERN synchrotron in Geneva, Switzerland. The unique facilities available at CERN allow us to simulate nanoparticle formation under ambient conditions and investigate potential influences of cosmic radiation. |
| Date: | Fri, 04.11.2016 |
| Time: | 10:30 |
| Duration: | 60 min |
| Location: | Seminarraum, Wohllebengasse 12-14 |
| Contact: | Jochen Schieck |
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