Calendar of Physics Talks Vienna

Probing new physics with open quantum systems (Vienna Theory Lunch Seminar)
Speaker: Christian Käding (TU Wien)
Abstract: The field theory of open quantum systems has ample applications in areas like particle or nuclear physics, cosmology, and quantum gravity. In this talk, I will introduce open quantum systems and their description via the Feynman-Vernon influence functional in field theory. Subsequently, I will discuss applications of this formalism to the search for new physics beyond the standard models of particles and cosmology. [[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 lis
Date: Tue, 09.01.2024
Time: 12:30
Duration: 75 min
Location:TU Wien: Wiedner Hauptstr. 8-10, yellow area, 10th floor, seminar room DB10E11
Contact:Florian Lindenbauer

Retention of fusion fuel in first wall materials: Influence of re-deposited tungsten on retention in Eurofer97 films
Speaker:Martina Fellinger (TU Wien, Institut für Angewandte Physik)
Abstract:The performance and the efficiency of nuclear fusion reactors are strongly influenced by retention of fusion fuel within the surrounding walls. Retention in these so-called plasma facing components (PFC) therefore needs to be investigated and quantified. Two promising material candidates for PFCs are W and a low activation steel alloy, Eurofer97. We investigated the influence of re-deposited W on Eurofer97 layers on the retention of D inside the material. Comparable temperature desorption spectroscopy (TDS) experiments were performed for cases with and without re-deposited W. Quantification was achieved by using Ion Beam Analysis (IBA) techniques. Results show that re-deposited W functions as an outgassing barrier for D retained in the Eurofer97 layer below.
Date: Tue, 09.01.2024
Time: 16:00
Location:TU Wien, Institut für Angewandte Physik, E134 1040 Wien, Wiedner Hauptstraße 8-10 Yellow Tower „B“, 5th floor, SEM.R. DB gelb 05 B
Contact:Prof. R.A. Wilhelm

Improving HEP Simulation and Analyses with Invertible Neural Networks
Speaker:Claudius Krause (HEPHY, Vienna)
Abstract:LHC run 3 just started and in the years leading up to 2040, we will see a 20-fold increase in available data. This forthcoming dataset will have enormous potential for a deeper understanding of the Standard Model and possible physics beyond it. In my talk, I will highlight how advancements in modern Machine Learning can help speed up crucial bottlenecks and open new avenues for model-agnostic searches of physics beyond the Standard Model. In particular, I will focus on Normalizing Flows (also known as invertible neural networks), which provide a versatile class of Machine Learning models that have seen many applications to high-energy physics. I will discuss how Normalizing Flows can be used to improve the unweighting efficiency in Monte Carlo event generation, speed up detector simulation, and how they can boost bump hunt searches for new physics.
Date: Tue, 09.01.2024
Time: 16:15
Duration: 60 min
Location:Fakultaet fuer Physik, Erwin Schroedinger-HS, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, M. Procura

Optimal feed-forward control for BEC experiments
Speaker:Nikolaus Würkner (TU Wien)
Abstract:Experiments with ultracold gases sometimes require dynamic manipulations. Using nonlinear trajectories for these manipulations enables faster transitions between desired states, e.g., so-called short-cuts to adiabaticity. Optimization based feed-forward control enables a systematic approach to designing these trajectories.
Date: Wed, 10.01.2024
Time: 16:15
Duration: 45 min
Location:Helmut Rauch Hörsaal ATI
Contact:Maximilian Prüfer

Anonymous communication in quantum networks
Speaker:Glaucia Murta (Universität Düsseldorf)
Abstract:The standard example of a cryptographic task is secure communication, in which two or more parties wish to exchange secret messages in the presence of an eavesdropper. In some scenarios, however, the identity of the communicating parties may also carry sensitive information. In these cases, we need to add anonymity as a security condition of the communication task, which aims to ensure that the identity of the communicating parties remains hidden throughout the protocol. In this talk, I will review previously introduced protocols for anonymous communication of a quantum state in a network and discuss their state of the art security proofs. Then I will consider the intermediate task of anonymously establishing a secret key among several users in a network and introduce a security framework that encompasses both, secrecy of the key and anonymity. I will then present efficient and noise-tol
Date: Fri, 12.01.2024
Time: 10:00
Duration: 45 min
Location:Helmut Rauch Hörsaal ATI
Contact:Elizabeth Agudelo