|
Calendar of Physics Talks Vienna
| Categorical Landau paradigm and Haagerup symmetry (online on Zoom!) |
| Speaker: | Lea Bottini (Oxford University) |
| Abstract: | In this talk I will present a general framework to study gapped phases and phase transitions of (1+1)d theories in the presence of non-invertible symmetries. This outlines a categorical version of the well known Landau paradigm for second order phase transitions. I will also show how we can use this approach to make progress on the longstanding question of finding a conformal field theory with the exotic Haagerup symmetry. |
| Date: | Tue, 20.05.2025 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | S. Fredenhagen, M. Sperling |
| Thermodynamic consistent theory of crosslinkers on biological filaments |
| Speaker: | Cédrik Barutel (TU Wien, IAP, FB Biophysik) |
| Abstract: | The cytoskeleton is the intracellular structure that enables cellular motion and essential cell-mechanical processes like cell division and chromosome segregation. It consists of filaments (actin, microtubules, intermediate filaments) that are connected by motor proteins and passive crosslinkers. Biologists and biochemists have uncovered and characterized many of the constituent proteins of the cytoskeleton. However, we are still lacking a deeper understanding of how the collective behavior of these parts working together emerges.
We know that filaments and crosslinkers organize into a dynamic network that keeps itself out of thermodynamic equilibrium by consuming chemical energy from the cellular environment. I aim to develop an out-of-equilibrium thermodynamic theory for understanding the forces that crosslinking proteins exert collectively between two filaments that they couple. More |
| Date: | Tue, 20.05.2025 |
| 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. Gerhard Schütz |
| Topology and singularities in cosmological spacetimes satisfying the null energy condition, part II |
| Speaker: | Carl Rossdeutscher (University of Vienna) |
| Abstract: | In last week's talk, Walter Simon presented singularity theorems for manifolds with spacelike Cauchy surfaces satifying certain convexity conditions.
The main theorem read:
If a globally hyperbolic spacetime admitting a closed, spacelike, 2-convex Cauchy surface is geodesically complete, then the Cauchy surface is either a spherical space or finitely covered by a surface bundle over the circle with totally geodesic fibres. We will recall these results and focus on the proof of the main theorem. The proof is divided into three parts. First, we identify a suitably embedded minimal surface. Second, assuming geodesic completeness, we construct a neighborhood foliated by minimal surfaces. Finally, we apply compactness theorems to extend this foliation to the entire manifold. |
| Date: | Wed, 21.05.2025 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Seminar Room A, Waehringer Str. 17, 1090 Wien, 2nd floor |
| Contact: | D. Fajman |
| Detecting genuine multipartite entanglement in multi-qubit devices with restricted measurements |
| Speaker: | Nicky Kai Hong Li (TU Wien Atominstitut) |
| Abstract: | The detection of genuine multipartite entanglement (GME) is a state-characterization task that can serve as a benchmark in that it confirms appropriate levels of coherence and the ability to control the system in the laboratory. However, many GME tests require joint measurements on all or the majority of the involved quantum systems, posing experimental challenges for experimental platforms such as time-multiplexed photonic architectures or microwave photons emitted from superconducting qubits. These systems typically have limited qubit connectivity or measurements with signal-to-noise ratios that scale adversely with the number of jointly measured qubits, imposing strict constraints on which joint measurements can be feasibly implemented. In this work,
(1) We propose a family of versatile GME criteria that only require measuring a small number of the graph state's stabilizers with weigh |
| Date: | Wed, 21.05.2025 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Maximilian Prüfer |
| Radioactive Molecular Sensors for Fundamental Physics |
| Speaker: | Kieran Flanagan (University of Manchester) |
| Abstract: | Molecules built with short-lived radioactive isotopes offer exciting new possibilities for studying fundamental physics. These molecules are potentially more sensitive to parity and time violating effects that would be signatures of new physics. Studying such systems is difficult because they don't last long, making them hard to work with. Only recently have we been able to measure the structure of some of these molecules, such as radium fluoride (RaF) and actinium fluoride (AcF), using a specialized spectroscopy technique at ISOLDE, CERN. This method, called collinear resonance ionization spectroscopy, allows measurements of radioactive molecules down to lifetimes of less than a second. The method produces the molecules as a relatively hot and fast beam, and to use them in future experiments, they need to be slowed down and cooled. In this talk I will present the recent work at ISOLDE a |
| Date: | Fri, 23.05.2025 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Tim Langen |
|