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Calendar of Physics Talks Vienna
| Beyond the Narrow-Width Limit for Off-Shell and Boosted Top Quark Decays (Vienna Theory Lunch Seminar) |
| Speaker: | Christoph Regner (Universität Wien) |
| Abstract: | This talk is part of the "Vienna Theory Lunch Seminar", a weekly seminar aimed at both graduate and advanced undergraduate students, jointly organized by the University of Vienna and TU Wien. The focus of the seminar is on recent theoretical research done by Master students, PhDs and PostDocs. Free lunch (pizza) will be provided at the seminar. For more information please visit our web page: https://lunch-seminar.univie.ac.at, where you can also subscribe to our mailing list. Please find the abstract on the web page as well. |
| Date: | Tue, 17.10.2023 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall |
| Contact: | Florian Lindenbauer |
| Black Hole Binary Dynamics from Classical and Quantum Gravitational Scattering |
| Speaker: | Prof. Thibault Damour (IHES - Institut des Hautes Etudes Scientifiques) |
| Abstract: | Gravitational wave signals from coalescing binary black holes are detected, and analyzed, by using large banks of template waveforms.
The construction of these templates makes an essential use of the analytical knowledge of the motion and radiation of gravitationally interacting binary systems.
A new angle of attack on gravitational dynamics consists of considering (classical or quantum) scattering states.
Modern amplitude techniques have recently giveninteresting novel results.
These results are reaching a levelwhere subtle conceptual issues arise (quantum-classical transition, radiative effects versus conservative dynamics, massless limit,...)
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| Date: | Tue, 17.10.2023 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Erwin Schroedinger-HS, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, A. Hoang, P. Chrusciel, D. Grumiller, H. Steinacker, T. Tran, A. Fiorucci |
| Characterization of the Galvanic Protection of Zinc Flake Coating by Spectroelectrochemistry and Industrial Testing |
| Speaker: | Florian Feldmann (TU Wien, IAP, FB Angewandte Grenzflächenphysik / Dörken Coatings GmbH & Co. KG) |
| Abstract: | The properties of hot-dip galvanised and electroplated zinc coatings on steel have been widely studied, but the corrosion mechanisms of zinc flake coatings have not yet been investigated in similar detail. Here, we present the protective effect of inorganic lamellar zinc coatings, comparing the metallic dissolution rates of different zinc, aluminium and alloyed flakes using an Inductively Coupled Plasma Mass Spectrometry (ICP-MS) flow cell. These experiments were carried out on both intact and pre-damaged coatings with different electrolytes. Data is also compared to accelerated laboratory corrosion tests and outdoor weathering results. The chloride concentration, and its effect on the passive oxide film, appears to be a key aspect moderating the dissolution rate and hence sacrificial zinc dissolution under various conditions. The complementary use of accelerated tests and ICP-MS flow ce |
| Date: | Tue, 17.10.2023 |
| 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: | Univ.Prof. Dr. Markus Valtiner |
| The status of naturalness I |
| Speaker: | Gian Giudice (CERN) |
| Abstract: | Naturalness arguments have been a powerful guiding principle for physicists as they try to construct new theories.
When applied to our current description of the microscopic world in terms of quantum field theory, naturalness leads
to the apparent paradox of the smallness of the electroweak scale and the cosmological constant, as compared to the Planck scale.
The hypotheses on which naturalness rests, the consequences of relaxing some of these hypotheses, and the current attempts to
develop new paradigms beyond naturalness will be discussed. |
| Date: | Tue, 17.10.2023 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Erwin Schroedinger-HS, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura |
| Visualising and quantifying adsorption on muscovite mica with AFM |
| Speaker: | Matteo Olgiati (TU Wien, IAP, FB Angewandte Grenzflächenphysik / CEST GmbH) |
| Abstract: | In the present contribution, we discuss how high-resolution atomic force microscopy (AFM) imaging enables us to visualize the lateral distribution of individual mono- and multi-valent ions on the surface of mica. Thanks to this approach, we are able not only to resolve the crystal structure of mica immersed in aqueous solution, but also to transiently picture the population of adsorbed ions from the salt-rich solutions at different concentrations. By using an automated triangulation algorithm, the ion adsorption coverage as a function of concentration can be quantified in a first order approximation. This methodology highlights the possibility to outline a certain competitive behaviour of charged species at the surface. Understanding such competition as a function of type and concentration of ions allows us to unravel the interfacial thermodynamics directly from AFM data, which has been |
| Date: | Tue, 17.10.2023 |
| Time: | 17:00 |
| 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: | Univ.Prof. Dr. Markus Valtiner |
| Uniqueness of asymptotically flat vacuum instantons with a cyclic isometry group |
| Speaker: | Walter Simon (Univ. Vienna) |
| Abstract: | We consider 4-dimensional, Ricci-flat and asymptotically flat (AF) manifolds with metrics of either Lorentzian or Euclidean signature,
and with a 1-parameter group of isometries whose Killing tangent vectors have bounded length at infinity. If non-flat we call such Lorentzian solutions stationary AF black holes (SBHs) and the Euclidean ones S1-AF instantons (SGIs). The latter play a role in the path integral approach to Quantum Gravity which we review briefly. We then recall known examples of SBHs and SGIs. We continue with explaining the "nuts and bolts" classification of SGIs which is the Euclidean counterpart to stationary and static black hole horizons. We next review the Kerr uniqueness results, which read that analytic, connected SBH must be Kerr, and that SGIs with 2 nuts must be Euclidean Kerr. . . . |
| Date: | Wed, 18.10.2023 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Isotopenphysik, VERA Seminar Raum, 1. Stock, Hoftrakt, Waehringer StraÃe 17 |
| Contact: | P. Chrusciel, D. Fajman |
| Entanglement Bounds and how to Find Them (for Electron-Photon Pairs) |
| Speaker: | Phila Rembold (TU Wien, Atominstitut) |
| Abstract: | Entanglement is a prime resource for tasks such as quantum information processing and quantum sensing. As a form of correlation that cannot be produced classically, entanglement creates a harnessable connection between two or more parties. However, to evaluate the potential of an entangled system, we need ways to quantify its entanglement. While this is straightforward for pure states, mixed states, which describe experimental realities, pose more of a challenge. Fortunately, even if we cannot exactly quantify the entanglement, there are valid ways to bound it. Working with the group of Philipp Haslinger, we are developing measurement schemes to bound the entanglement between an electron and a photon produced via the Cherenkov effect. These are represented not only as mixed states, but also continuous variable systems. During this talk, I will introduce the necessities and difficulties o |
| Date: | Wed, 18.10.2023 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Maximilian Prüfer |
| "Supersymmetry in the adjoint representation" aka "Unconventional Supersymmetry" |
| Speaker: | Pedro Alvarez (University of Antofagasta, Chile) |
| Abstract: | We study a general recipe to implement models for gravity, gauge
theories and matter using the adjoint representation of the
superconformal algebra. A striking feature of the model is that
fermion/boson matching of d.o.f. is not mandatory. Standard gauge
kinetic terms are included. The models are highly predictive, with
very few free parameters in the action. We will discuss general
properties of the theory and interesting gravitational solutions that
are found on it. |
| Date: | Thu, 19.10.2023 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | TU Wien, Freihaus, Sem.R. DA green 02 C - GEO |
| Contact: | Benjamin Koch, Iva Lovrekovic |
| Have Majorana zero modes been observed? |
| Speaker: | Georgios Katsaros (IST Austria) |
| Abstract: | Hybrid semiconductorâsuperconductor devices hold great promise for realizing Majorana zero modes [1-3]. However, multiple claims of Majorana detection, based on either tunnelling or Coulomb blockade (CB) spectroscopy, remain disputed. In this talk I will introduce an experimental protocol that allows to perform both types of measurement on the same hybrid island by adjusting its charging energy via tunable junctions to the normal leads [4,5]. This method reduces ambiguities of Majorana detections by checking the consistency between CB spectroscopy and zero-bias peaks in non-blockaded transport. I will discuss the theoretical interpretation of the experimental observations in terms of low-energy, longitudinally confined island states rather than overlapping Majorana modes. The results highlight the importance of combined measurements on the same device for the identification of topologica |
| Date: | Fri, 20.10.2023 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Julian Leonard |
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