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Calendar of Physics Talks Vienna
| Robust time crystals in semiconductors |
| Speaker: | Prof. Manfred Bayer (TU Dortmund) |
| Abstract: | Crystals spontaneously break the continuous translation symmetry of free space. Analogously, time crystals (TC) lift translational invariance in time. Continuous time crystals are a result of time-independent external driving, which compensates exactly for the systemâs energy losses. As a specific example, we describe a time crystal implemented in the coupled electron-nuclei spin system of a tailored semiconductor, featuring spontaneous breaking of the translational symmetry of time. |
| Date: | Mon, 27.05.2024 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | TU Wien, Freihaus, Hörsaal 5, https://tuw-maps.tuwien.ac.at/?q=DA02G15 |
| Contact: | Andrei Pimenov |
| Asymptotic symmetries of new 3d conformal higher spin theories for low spins (Vienna Theory Lunch Seminar) |
| Speaker: | Iva Lovrekovic (TU Wien) |
| Abstract: |
We study asymptotic symmetries for 3d Chern-Simons theory as a gauge theory of so(3,2), sl_4 and sl_5 algebras. For the near horizon boundary conditions we present solutions from several projectors from Chern-Simons to the metric formulation. We also study the classification according to so(3,2) one parameter subgroups and classify obtained solutions.
[[part of the "Vienna Theory Lunch Seminar, see https://lunch-seminar.univie.ac.at ]]
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| Date: | Tue, 28.05.2024 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | University of Vienna: Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall |
| Contact: | Florian Lindenbauer |
| Shadows of new physics on analog systems, GUPs and other amusements |
| Speaker: | Alfredo Iorio (Charles University, Prague) |
| Abstract: | After a brief introduction to the analog enterprise in general, and to Dirac materials in particular, I shall show how, when higher-order effects in the parameter $\ell/\hbar |p|$, related to the lattice spacing $\ell$, are considered, Dirac materials can be used as tabletop systems where generalized commutation relations are naturally realized. Such algebras, which lead to generalized versions of the Heisenberg uncertainty principle, are under intense scrutiny these days, as they could be the effect of a fundamental length scale of space. Despite the efforts and the many intriguing theoretical results, though, there are no experimental signatures of any generalized uncertainty principle (GUP). Therefore, our results here could be of interest to practitioners of the phenomenology of quantum gravity. We identify three different energy regimes that we call `layers', where the physics [...] |
| Date: | Tue, 28.05.2024 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Boltzmanngasse 5, 1090 Wien, Austria (Schroedinger Hoersaal) |
| Contact: | Adrien Fiorucci, Daniel Grumiller |
| Evolution and Observation of Red Giant Stars |
| Speaker: | Dr. Stefan Uttenthaler (Technische Universität Wien, Institut für Angewandte Physik) |
| Abstract: | Very diverse research in different fields of physics is done at the Institute of Applied Physics, yet one is probably not so much known: The research on red giant stars. These are cool, luminous giant stars of low or intermediate mass in a late phase of stellar evolution. In the distant future, also the Sun will eventually turn into a red giant star. They are fascinating objects also from the point of view that a wide array of physical processes need to be studied for a better understanding of the starsâ properties: From nuclear fusion processes in their interior, via atomic and molecular physics in their atmospheres, to the growth of dust grains in their extended envelopes and stellar winds. The talk will give a short introduction to the evolution of red giant stars, describe their characteristic properties, and how they can be observed. In particular, it will focus on the starsâ variab |
| Date: | Tue, 28.05.2024 |
| Time: | 16:00 |
| Location: | TU Wien, Institut für Angewandte Physik, E134 1040 Wien, Wiedner HauptstraÃe 8-10 Yellow Tower âBâ, 5th floor, SEM.R. DB gelb 05 B |
| Contact: | Prof. Gareth Parkinson |
| Dark state pair-production in underground accelerators and their detection |
| Speaker: | Maximilian Fahrecker (University of Vienna) |
| Abstract: | We explore the possibility of new light fermionic particles with electromagnetic form factor interactions and their production and detection in underground low-energy high-intensity electron beams. The particles could be dark matter candidates. The detection will be facilitated by using a novel CCD-sensor. We calculate the corresponding cross sections while discussing constraints from cosmology, astrophysics and high-precision particle physics. These theoretical results can then be checked against measurements. |
| Date: | Tue, 28.05.2024 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura |
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