
Calendar of Physics Talks Vienna
The functorial axiomatization of topological quantum field theory (Vienna Theory Lunch Seminar) 
Speaker:  Tim LÃÂ¼ders (UniversitÃÂ¤t Wien) 
Abstract:  In this talk, I will give a lightning introduction to topological quantum field theory in its functorial axiomatization, due to Atiyah and Segal. We start by exploring the very basics of the mathematical discipline of category theory, which will then be used as a convenient tool to package essential properties of FeynmanÃ¢ÂÂs path integral into a mathematically rigorous framework. Examples of physical theories that can be described in this setting include ChernSimons theory as well as topological sigma and state sum models. I will finish the talk by mentioning several natural generalizations of the introduced mathematical structures, and what physical interest each of them carries.
[[part of the "Vienna Theory Lunch Seminar, see https://lunchseminar.univie.ac.at ]] 
Date:  Tue, 05.03.2024 
Time:  12:30 
Duration:  75 min 
Location:  University of Vienna, Boltzmanngasse 5, 5th floor, SchrÃÂ¶dinger Lecture Hall 
Contact:  Florian Lindenbauer 
Quasinormal modes of black holes in classical and alternative theories of gravity 
Speaker:  Angel Rincon (Universidad de Alicante) 
Abstract:  In this talk, we study neutral massless/massive scalar field perturbations around different black hole backgrounds in several dimensions. We reduce the problem to its Schroedingerlike form, obtain the effective potential, and then calculate the corresponding quasinormal modes. For wellbehaved black holes, we take advantage of the WKB method to obtain the spectrum. As usual, the quasinormal modes depend on the parameters of the black hole, so by varying them we can see how their variations affect the Quasi Normal frequencies. 
Date:  Tue, 05.03.2024 
Time:  14:00 
Duration:  60 min 
Location:  Erwin SchroedingerHoersaal (Boltzmanngasse 5, 5th floor) 
Contact:  Adrien Fiorucci, Benjamin Koch, Daniel Grumiller 
NanoPrinting using Charged Particle Beams: Precursors, Processing and Hybrid Approaches 
Speaker:  Sven Barth (Physics Institute, Goethe University Frankfurt/Germany Inorganic Chemistry Institute, Goethe University Frankfurt/Germany) 
Abstract:  The vast field of additive manufacturing includes true nanoprinting techniques based on charged particle beams of ions and electrons. Besides applications such as mask repair in semiconductor industry, further development of precursor chemistry and writing techniques will enable fundamental studies of shapedependent phenomena and the fabrication of functional nanostructures on literally any surface. This talk will introduce focused electron/ion beam deposition (FEBID/FIBID) techniques as a very convenient for the spatially controlled formation of pure metals and more complex compositions. The basics of the processes will be outlined [1] and specific examples of FEBID/FIBIDderived material will be presented.[24] Moreover, the influence of precursor chemistry, deposition strategy and postgrowth processing on the depositâs composition and physical properties will be discussed. Finally, 
Date:  Tue, 05.03.2024 
Time:  16:00 
Location:  TU Wien, Institut fÃ¼r Angewandte Physik, E134 1040 Wien, Wiedner HauptstraÃe 810 Yellow Tower âBâ, 5th floor, SEM.R. DB gelb 05 B 
Contact:  Prof. Amalio FernandezPacheco Chicon 
Analogue Quantum Simulators  tabletop experiments for quantum field theory 
Speaker:  Sebastian Erne (TU Wien, Atominstitut) 
Abstract:  Analogue (quantum) simulators have gained increasing traction over the last decade as an interdisciplinary branch between experimental and theoretical physics. They present an ideal platform to study fundamental questions of quantum field theory, which are otherwise not or only indirectly accessible in experiments. After giving an introduction to analogue gravity and cosmology based on classical and quantum fluids, I will present recent results of our research on analogue QFT simulators in and beyond the linear regime of the sineGordon model. The aim of this talk is to give an overview of the general ideas behind continuous (quantum) field theory simulators based on ultracold atom systems, and the opportunities these offer for the experimental exploration of QFT in flat and curved spacetime. 
Date:  Wed, 06.03.2024 
Time:  16:15 
Duration:  45 min 
Location:  Helmut Rauch HÃ¶rsaal ATI 
Contact:  Maximilian PrÃ¼fer 
