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Calendar of Physics Talks Vienna
| Learning holographic horizons (Vienna Theory Lunch Seminar) |
| Speaker: | Sukrut Mondkar (Harishchandra Research Institute) |
| Abstract: | We apply machine learning to understand fundamental aspects of holographic duality, specifically the entropies obtained from the apparent and event horizon areas. We show that simple features of only the time series of the pressure anisotropy can predict the areas of the apparent and event horizons in the dual bulk geometry at all times. Given that simple Vaidya-type metrics constructed just from the apparent and event horizon areas can be used to approximately obtain unequal time correlation functions, we argue that the corresponding entropy functions are the measures of information that need to be extracted from simple one-point functions to reconstruct specific aspects of correlation functions of the dual state with the best possible approximations.
[[https://lunch-seminar.univie.ac.at]]
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| Date: | Tue, 25.06.2024 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | TU Wien: Wiedner Hauptstr. 8-10, yellow area, 10th floor, seminar room DB10E11 |
| Contact: | Florian Lindenbauer |
| Dynamics of encapsulation: Clusters under the (fast) STM |
| Speaker: | Friedrich Esch (Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, Garching/Germany) |
| Abstract: | Catalysts on reducible oxide supports often change their activity significantly at elevated temperatures due to the strong metal-support interaction (SMSI), which induces the formation of an encapsulation layer around the noble metal particles. While the encapsulation is well established for nanoparticles, it remains to be explored for small, sub-nm clusters â how does the encapsulation layer form, and what is its impact on cluster stabilization and catalytic activity?
In the present work, we employ scanning tunneling microscopy (STM, upgraded by sophisticated fast tools for movie acquisition and cluster tracking [1]), pulsed valve molecular beam âsnifferâ measurements in combination with X-ray photoelectron spectroscopy to study atomically precise Ptn clusters (5â¤nâ¤20) deposited on Fe3O4(001) and to compare the results to other reducible oxide supports, TiO2(110) and CeO2(111). On mag |
| Date: | Tue, 25.06.2024 |
| 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. G.S. Parkinson |
| Exploring mutual information in 2D field theory simulators |
| Speaker: | Maciej Jarema (University of Nottingham ) |
| Abstract: | In recent years, mutual information has gained significant attention across many communities.
Researchers studying condensed matter theory and quantum field theories in curved spacetime frequently utilise this quantity due to its ability to assess correlations. Recently, foundational work in 1D Bose-Einstein condensates provided a remarkable tool for studying mutual information experimentally. In this talk, I will first overview key concepts in mutual information research. Next, I will discuss the possible extensions of mutual information analysis to 2D systems and new avenues this may open in the near future. Finally, I will introduce our field theory simulator utilizing thin films of superfluid helium-4 and its potential uses in experimental
studies of mutual information.
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| Date: | Wed, 26.06.2024 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Helmut Rauch Lecture Hall |
| Contact: | Mohammadamin Tajik |
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