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Calendar of Physics Talks Vienna
| Quantum Trajectories in Monitored Mean-Field Systems |
| Speaker: | Guido Giachetti (ENS, Paris) |
| Abstract: | Monitored quantum systems have attracted significant interest in recent years due to the possibility of observing measurement-induced phase transitions (MIPTs) in the full-counting statistics of quantum trajectories corresponding to different measurement outcomes. In this talk, we analyze the behavior of quantum trajectories in fully connected spin systems. We first focus on trajectories that admit a well-defined semiclassical limit by studying the monitored Lipkin–Meshkov–Glick (LMG) model. Owing to the mean-field nature of the interactions, this model exhibits a transition already at the Lindbladian level, that, however, we were able to fully understand only through the analysis of individual quantum trajectories. Next, we examine the purification dynamics of a fully connected, noisy Heisenberg model. Even in the absence of a clear semiclassical limit, we successfully characterize the |
| Date: | Mon, 27.10.2025 |
| Time: | 11:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Julian Léonard |
| Bayesian tools for the LHC: a proof of concept in di-Higgs searches |
| Speaker: | Santiago Tanco (Universidad Nacional de La Plata, Argentinia) |
| Abstract: | Extracting reliable physical information from collider data requires a combination of mathematical, computational and statistical tools to model observed and expected distributions, often with the help of powerful simulations. When simulations cannot be fully trusted, data-driven approaches become indispensable. I will present Bayesian tools that provide a flexible, data-driven method for unsupervised training on probabilistic models of collider observables, highlighting their advantages for parameter inference and uncertainty estimation. I will illustrate these points in the context of pp > hh > bbbb searches, where recent analyses use a variation of the widely used data-driven "ABCD method". Within our framework, the ABCD method can be generalized and improved, especially when its assumptions are not exactly satisfied, leading to more robust background subtraction. Based on 2402.08001 |
| Date: | Tue, 28.10.2025 |
| Time: | 10:00 |
| Duration: | 60 min |
| Location: | PSK (Postsparkasse) meeting room 1 (in the 3rd floor) |
| Contact: | Claudius Krause (MBI Vienna) |
| Quantum Vacua of Orthosymplectic Chern-Simons Matter Theories |
| Speaker: | Sinan MOURA SOYSUEREN (University of Vienna) |
| Abstract: | Supersymmetric quantum field theories with eight supercharges exhibit moduli spaces of vacua with rich mathematical structure, encoding fundamental physical processes. Amongst the tools to study such moduli spaces, the magnetic quiver program offers a systematic approach across the landscape of theories ranging from three to six spacetime dimensions.
In this talk, I will present a first approach to a magnetic quiver framework that captures the moduli space of N=3 orthosymplectic Chern-Simons Matter theories in three spacetime dimensions.
Based on work [arXiv:2509.11733] with F. Marino and M. Sperling |
| Date: | Tue, 28.10.2025 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Lecture Hall, 1090 Vienna, Boltzmanngasse 5, 5th floor |
| Contact: | S. Fredenhagen, M. Sperling |
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