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Calendar of Physics Talks Vienna
| Speaker: | Ingo Runkel (University of Hamburg) |
| Abstract: | The study of topological defects in quantum field theory has seen a wealth of activity recently leading to many interesting insights, for example the explicit realisation of non-invertible topological defects in higher dimensional QFTs or the description of the higher algebraic structures inherent in these topological defects.
In this talk, I would like to give a gentle introduction to this topic using the two-dimensional Ising model on the lattice and in the continuum as an example. |
| Date: | Tue, 29.04.2025 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger Lecture Hall, 1090 Vienna, Boltzmanngasse 5, 5th floor |
| Contact: | S. Fredenhagen, M. Sperling, N. Carqueville |
| From scales to shapes: theory uncertainties with theory nuisance parameters in the Drell-Yan qT spectrum |
| Speaker: | Giulia Marinelli (DESY Hamburg) |
| Abstract: | Recent measurements have reached sub-percent accuracy, opening the door to detailed studies of theoretical inputs that are crucial within the Standard Model.
Given this level of precision â and the fact that an accurate description of the qT spectrum involves many different theoretical ingredients â a robust treatment of theoretical predictions and their associated uncertainties is essential.
Among these, perturbative uncertainties remain dominant and are traditionally estimated via scale variations. However, this method has well-known limitations.
In this talk, I will present a novel approach based on theory nuisance parameters (TNPs) to quantify such uncertainties.
This method properly accounts for theoretical correlations and enables the data itself to constrain, and potentially reduce, these uncertainties in a consistent way. |
| Date: | Tue, 29.04.2025 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger Lecture Hall, 1090 Vienna, Boltzmanngasse 5, 5th floor |
| Contact: | A. Hoang, M. Procura |
| Wigner's Friend with an Environment and a Dynamical Model of Measurements |
| Speaker: | Tom Rivlin (TU Wien, Atominstitut) |
| Abstract: | The Wignerâs Friend thought experiment and its variants reveal several paradoxes concerning how agents reason about the outcomes of quantum measurements. But most theoretical and experimental studies of these scenarios model the agents as single qubits, even though some of the paradoxes require the agents to be able to âreasonâ about quantum measurements. These studies also often ignore potential effects due to decohering environments. In this talk, I will present theoretical investigations of some Wignerâs Friend setups that include a wider environment inside the lab, and that allow the agents to be made of many qubits. Crucially, measurement is also modelled here as a unitary, dynamic process in its own right. These results will demonstrate how classical ignorance and the specifics of the measurement process can mask quantum effects in Wignerâs Friend scenarios.
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| Date: | Wed, 30.04.2025 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Maximilian Prüfer |
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