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Calendar of Physics Talks Vienna
| Probing Quantum Aspects of Gravitational Fields (Vienna Theory Lunch Seminar) |
| Speaker: | Lin-Qing Chen (IQOQI & Uni Wien ) |
| Abstract: | Recent progress in table-top experiments offers the opportunity to show for the first time that gravity is not compatible with a classical description. However, in all current experimental proposals, such as the generation of gravitationally induced entanglement between two quantum sources of gravity, gravitational effects can be explained with the Newton potential. This is a limitation to the conclusions on the nature of gravity that can be drawn from these experiments. Here, I will introduce a theoretical framework that is suitable for this experimental regime, and we identify two effects that overcome the above-mentioned limitation. First, we show that the phase arising from the interaction between two generic quantum sources of gravity, cannot be reproduced with the Newton potential nor with any limit of (classical) general relativity. [ part of https://lunch-seminar.univie.ac.at ] |
| Date: | Tue, 12.11.2024 |
| Time: | 12:15 |
| Duration: | 75 min |
| Location: | University of Vienna, Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall |
| Contact: | Florian Lindenbauer |
| Entanglement Resolution and boundary CFT |
| Speaker: | Christian Northe (Czech Academy of Sciences) |
| Abstract: | In this talk I will explain how computations in entanglement studies can be refined by the use of BCFT. The focus will lie on the entanglement spectrum, which is known to encode fundamental aspects of entanglement, such as topological signatures. Given a symmetry on an entangling subregion, the reduced density matrix decomposes into sectors corresponding to charge eigenvalues of the symmetry. I will discuss how the information or uncertainty in these sectors is quantified, first for U(1) symmetry and thereafter for the infinite-dimensional conformal symmetry in two spacetime dimensions. Finally, the information count of each sector will be compared leading to a simple yet striking lesson for gravity. If time permits, I will discuss how the celebrated Affleck-Ludwig boundary entropy decomposes into symmetry sectors. |
| Date: | Tue, 12.11.2024 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | S. Fredenhagen, M. Sperling |
| Mie-resonance-enhanced Brillouin light scattering microscopy for nanoscale spin wave research |
| Speaker: | Michal Urbánek (CEITEC BUT, Brno University of Technology, Brno/CZ) |
| Abstract: | Magnonics is seen nowadays as a candidate technology for energy-efficient data processing in classical and quantum systems [1]. Wavelike nature with pronounced nonlinearity and anisotropy of dispersion relations of spin waves and their quantum mechanical counterparts magnons require advanced measurement instrumentation and methodology. Brillouin light scattering (BLS) spectroscopy and microscopy was a technique of choice for many pioneering magnonic experiments [2, 3]. However, for device miniaturization, a shift towards nanoscale spin waves is necessary. Until now, the BLS technique fell short here due to its fundamental limit in maximum detectable magnon momentum (which corresponds to the spin wave wavelength of ~0.6 ïm). Previous attempts to measure nanoscale spin waves relied on nanosized apertures or other plasmonic structures made of metals to locally enhance the electromagnetic fi |
| Date: | Tue, 12.11.2024 |
| 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. Amalio Fernandez-Pacheco |
| Harnessing intricacies of Jets for Breakthroughs in QCD at the Collider Frontier |
| Speaker: | Kyle Lee (MIT) |
| Abstract: | Jets have been pivotal in the advancement of Quantum Chromodynamics (QCD) since its inception, serving as a bridge between collider phenomenology and the formal language of field theory. Modern jet analysis empowers us to achieve significant breakthroughs in our understanding of QCD and enables direct comparisons with experimental data. In this talk, I will outline several key research areas within jet physics that deepen our understanding of QCD. These include deepening our understanding of heavy quark dynamics, investigating the effects of the medium, unraveling the hadronization process, and precision determination of the strong coupling. I will highlight the application of these studies at current colliders like the LHC, RHIC, and EIC. |
| Date: | Tue, 12.11.2024 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, 1090 Vienna, Boltzmanngasse 5, 5th floor |
| Contact: | A. Hoang, M. Procura |
| Monte Carlo simulation of a planar accretion of the relativistic Vlasov gas onto a moving Schwarzschild black hole |
| Speaker: | Adam Cieslik (Jagiellonian University) |
| Abstract: | I will present the results of a Monte Carlo simulation of a planar accretion of the relativistic Vlasov gas onto a moving Schwarzschild black hole. The gas is assumed to be in thermal equilibrium at infinity, where it obeys the Maxwell-Jüttner distribution. This simulation methodology builds on the approach developed last year for a stationary Schwarzschild black hole. I will elucidate the modifications necessary for setting up the simulation for the complexities introduced by black hole motion. Furthermore, our Monte Carlo results consistently confirm the analytically derived exact expressions for particle current density in all examined cases. |
| Date: | Wed, 13.11.2024 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Seminarraum A, Waehringer Strasse 17, 2nd Floor |
| Contact: | Piotr T. Chrusciel, David Fajman |
| High-dimensional entanglement witnessed by correlations in arbitrary bases |
| Speaker: | Kai Hong Li (TU Wien, Atominstitut) |
| Abstract: | Certifying entanglement is an important step in the development of many quantum technologies, especially for higher-dimensional systems, where entanglement promises increased capabilities for quantum communication and computation. A key feature distinguishing entanglement from classical correlations is the occurrence of correlations for complementary measurement bases. In particular, mutually unbiased bases (MUBs) are a paradigmatic example that is well-understood and routinely employed for entanglement certification. However, implementing unbiased measurements exactly is challenging and not generically possible for all physical platforms. In this work, we expand the entanglement-certification toolbox by extending the use of correlations in MUBs to arbitrary bases, even without requiring aligned reference frames. This represents a practically significant simplification that paves the way |
| Date: | Wed, 13.11.2024 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Maximilian Prüfer |
| Light transformation in Celestial and Carrollian CFT |
| Speaker: | Sourish Banerjee (BITS-Pilani, Goa, India) |
| Abstract: | In this talk I will briefly introduce Celestial CFT and Carrollian CFT and then go on to discuss the consequence of spacetime translations and Lorentz transformations on Celestial CFT OPEs. Working with the light transforms of the operators belonging to the modified Mellin basis, I will show that the leading order singularity in the OPE of such operators could be fixed purely using Poincare symmetries owing to the non-trivial action of the translations on these operators. I will discuss how this approach could potentially be useful for studying Celestial CFT without adverting to bulk physics. As another goal of this talk, I will discuss the significance of light transformation in Carrollian CFTs. In the special cases we considered, we show that light transformation equips us with a map between two branches of Carroll CFT in d = 3 dimension at the level of correlation functions. |
| Date: | Thu, 14.11.2024 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | TU Wien Freihaus, Seminar room DB10E11 (10th floor, yellow area) |
| Contact: | Daniel Grumiller, Ankit Aggarwal |
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