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Calendar of Physics Talks Vienna
| Spectral dimension and other geometry estimators in random fuzzy spaces |
| Speaker: | Lisa Glaser (Univ. Wien) |
| Abstract: | Random fuzzy spaces are a matrix model of non-commutative geometries. Calculating the path integral over these geometries numerically has shown indications of a phase transition, and given rise to the idea that the geometries at this phase transition might be two dimensional. To better understand these geometries and the phase transition we have explored spectral estimators for different geometric properties. In this talk, based on https://arxiv.org/abs/1902.03590, I will introduce the ensemble of random fuzzy spaces and show some of the spectral estimators we constructed. |
| Date: | Tue, 02.04.2019 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, D. Grumiller |
| Mysteries of the Higgs Boson |
| Speaker: | Michael E. Peskin (SLAC, Stanford University) |
| Abstract: | 1.Vorlesung im Rahmen der Schrödinger-Gastprofessur 2019:Thirty-five years after it was postulated as a key component of the theory of weak interactions,the Higgs boson was discovered at the CERN Large Hadron Collider in 2012.Since that time, the major couplings of the Higgs boson have been measured at the LHC,with results in good accord with the simplest theoretical expectations.They are consistent with a picture in which the Higgs field has a nonzero amplitude everywhere in space, the result of a phase transition that took place in the early universe and this field value gives mass to all known elementary particles.However, we should not be complacent.We have no explanation of why this phase transition took place, or why the other interactions of the Higgs boson are as we see them.This mystery goes to the heart of elementary particle physics.The answers to other important questions ... |
| Date: | Tue, 02.04.2019 |
| Time: | 16:15 |
| Duration: | 90 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| Physics with cold highly charged ions - the HITRAP facility |
| Speaker: | Dr. Manuel Vogel (GSI, HITRAP collaboration) |
| Abstract: | Highly charged ions subject their remaining bound electrons to the most extreme electromagnetic fields available and change their properties drastically. This holds true in particular for their magnetic moments and transition energies and lifetimes. Precision measurements of these quantities allow us to test predictions of QED in a regime yet unavailable and to infer fundamental information about the systems in view. This is possible by optical and microwave spectroscopy of highly charged ions confined in Penning traps and cooled to energies below meV. In this presentation, I will introduce to the HITRAP facility designed to cool highly charged ions from MeV to meV energies, and two experiments currently located at that facility: the ARTEMIS Penning trap experiment and SPECTRAP ... [full abstract available here: https://indico.smi.oeaw.ac.at/event/317 ] |
| Date: | Wed, 03.04.2019 |
| 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 |
| Probing the spacetime curvature using geometric optics |
| Speaker: | Mikolaj Korzynski (Warsaw) |
| Abstract: | In general relativity light propagation is affected by gravity, leading to the well-known effects of light bending, Shapiro delays and gravitational redshift. On top of that the results of observation of light by an observer are also affected by the special relativistic phenomena like the aberration or time dilation. All these effects influence the measurements of shape, parallax, redshift and position drift (proper motion) of distant objects. We show that all results of those measurements can be understood as functions of the curvature along the line of sight. This opens up the possibility to probe the spacetime curvature directly using only optical observations. |
| Date: | Thu, 04.04.2019 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel, D. Fajman |
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