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Calendar of Physics Talks Vienna
| Phase separation dynamics in a binary mixtures of ultrasoft particles (Vienna Theory Lunch Seminar) |
| Speaker: | Tanmay Biswas (TU Wien) |
| Abstract: |
Phase separation plays a crucial role in determining the self-assembly of biological and soft matter systems. In the former case, liquid-liquid phase separation inside a cell leads to the formation of various macromolecular aggregates. The interaction among these aggregates is soft and the particles are generally modelled by ultrasoft particles. We have studied the phase separation dynamics of binary mixture of ultrasoft particles (with species A and B). When quenched to a lower temperature below critical temperature, the system undergoes a phase separation into an A-and a B-rich phase. In detailed and extensive molecular dynamics simulations we have identified the critical point. When cooling the system the domains of the two components grow in a power-law manner with an exponent [[... full abstract https://lunch-seminar.univie.ac.at ]] |
| Date: | Tue, 04.06.2024 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | TU Wien: Wiedner Hauptstr. 8-10, yellow area, 10th floor, seminar room DB10E11 |
| Contact: | Florian Lindenbauer |
| Exploring the higher structure of symmetries [start at 14.30!] |
| Speaker: | Michele Del Zotto (Uppsala U., Dept. Math. and Theor. Phys. Division) |
| Abstract: | Recent progress in our understanding of symmetries of quantum fields indicates these are encoded by a collection of topological membranes of various dimensionality, encoding the conserved quantum numbers of extended operators. One feature of topological membranes is that they can form intricated networks of topological junctions, which give generalized symmetries a higher structure. The higher structure has physical implications, for example in the form of selection rules, anomalies, and generalized Ward identities. In this talk, after introducing these ideas, I will discuss some recent progress in characterizing the higher structure of the symmetries of axion-Maxwell theory as a concrete example. Based on an upcoming work with Matteo DellÃÂâÃÂÃÂÃÂÃÂAcqua, Shani Nadir Meynet and Elias Riedel-GÃÂÃÂÃÂÃÂ¥rding. |
| Date: | Tue, 04.06.2024 |
| Time: | 14:30 |
| Duration: | 60 min |
| Location: | (1) ZOOM: https://univienna.zoom.us/j/65968312253?pwd=ZBMvPi94sEV144Paq58oFd5ymZnRKb.1 (passcode: 113868) (2) STREAM @ TUWien Freihaus, Wiedner Hauptstr. 8, 3rd floor, yellow tower, Sem. R. DB gelb 03 |
| Contact: | Marcus Sperling, Tung Tran, Adrien Fiorucci |
| QCD Factorization and Resummation from Heavy Jets to Heavy Hadrons |
| Speaker: | Johannes Michel (University of Amsterdam) |
| Abstract: | Existing data from LEP, B factories, and the LHC, as well as the experimental programs at the upcoming EIC and other future colliders, contain the key to a new level of depth in our understanding of QCD. These advances can range from precision determinations of the strong coupling -- the main parameter of QCD -- to new ways of probing the still-mysterious physics of hadronization, but require equally precise and refined first-principle QCD predictions. In the first part of my talk, I will discuss the all-order resummation of perturbative logarithms near so-called Sudakov shoulders, specifically for the case of the heavy jet mass (HJM) event shape in electron-positron collisions. I present a unified formalism that describes the partonic HJM distribution from the dijet to the shoulder region, and discuss in particular how we cleared a roadblock on the way to higher perturbative precision b |
| Date: | Tue, 04.06.2024 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura |
| Multi-copy activation of genuine multipartite entanglement in continuous-variable systems |
| Speaker: | Klara Baksova (TU Wien Atominstitut) |
| Abstract: | In multipartite scenarios in entanglement theory, one has to consider separability with respect
to different partitions, which results in a more complicated structure of the state space than in
bipartite scenarios. There, states exhibiting genuine multipartite entanglement (GME) form a
non-convex complement to a convex set of biseparable states (convex hull of all states that are
separable with respect to some bipartition).
Multi-copy activation of GME is a phenomenon whereby multiple shared copies of certain biseparable states can exhibit GME. This was first shown for isotropic GHZ states and later proven tobe generically possible in finite-dimensional systems.
We extend this analysis to infinite dimensions by reconstructing presumably GME-activatable
continuous-variable biseparable states and testing their GME activitability. We divide our investigation into two areas: Gaussian states |
| Date: | Wed, 05.06.2024 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Helmut Rauch Lecture Hall |
| Contact: | Maximilian Prüfer |
| Categorical-Symmetry Resolved Entanglement in CFT |
| Speaker: | Arpit Das (School of Mathematics - The University of Edinburgh) |
| Abstract: | In this talk, we will discuss a symmetry-resolved entanglement for categorical symmetries (CaT-SREE) in 2D CFTs. The definition will parallel that of group-like symmetries employing the concept of symmetric boundary states, but with respect to a categorical symmetry. We shall apply this to rational CFTs, where the behaviour of CaT-SREE mirrors that of group-like symmetries. This includes instances of the breakdown of entanglement equipartition at the next-to-leading order in the cut-off expansion. This will shed light on the interplay between categorical symmetries, entanglement, and boundary conditions in 2D CFTs.
Based on -- arXiv: 2402.06322 [hep-th]
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| Date: | Thu, 06.06.2024 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | TU Wien, Freihaus, Seminar room on the 10th floor |
| Contact: | Daniel Grumiller, Iva Lovrekovic |
| Learning to predict ground state properties of gapped Hamiltonians |
| Speaker: | Richard Küng (Universität Linz) |
| Abstract: | Classical machine learning (ML) provides a potentially powerful approach to solving challenging quantum many-body problems in physics and chemistry. However, the advantages of ML over traditional methods have not been firmly established. In this work, we prove that classical ML algorithms can efficiently predict ground-state properties of gapped Hamiltonians after learning from other Hamiltonians in the same quantum phase of matter. By contrast, under a widely accepted conjecture, classical algorithms that do not learn from data cannot achieve the same guarantee. Our proof technique combines signal processing with quantum many-body physics and also builds upon the recently developed framework of classical shadows. I will try to convey the ideads and also present numerical experiments that address the anti-ferromagnetic Heisenberg model and Rydberg atom systems.
This is based on joint wo |
| Date: | Fri, 07.06.2024 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Philipp Haslinger |
| Minimal sterile neutrino dark matter |
| Speaker: | Torsten Bringmann (University of Oslo) |
| Abstract: | Sterile neutrinos constitute a very well-motivated extension of the standard model of particle physics. For masses in the keV range, furthermore, they provide excellent candidates for the cosmologically observed dark matter. Producing them with the correct
primordial abundance requires additional new physics, however, given that the simplest
production mechanism via oscillations is observationally ruled out.
In this talk I will briefly review generic mechanisms for the genesis of dark matter, with a focus on a newly proposed production scenario that is characterized by an era of exponential growth of the dark matter density in the early universe. I will then demonstrate
how such a scenario is naturally realized for for sterile neutrinos in a very minimal setup. I further show how this idea opens up highly relevant -- and relatively shortly testable -- new parameter space for ste |
| Date: | Fri, 07.06.2024 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, Boltzmanngasse 5, 5. Stock |
| Contact: | J. Pradler |
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