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Calendar of Physics Talks Vienna
| 4d Maxwell on the Edge: Global Aspects of Boundary Conditions and Duality |
| Speaker: | Riccrdo Argurio (University of Brussels) |
| Abstract: | We revisit Maxwell theory in 4d with a boundary, with particular attention to the global properties of the boundary conditions, both in the free (topological) and interacting (conformal) cases. We analyze the fate of Wilson-'t Hooft lines, identifying the subset that is trivialized on the boundary and the ones that become topological, thus generating a boundary 1-form symmetry. We further study how the boundary conditions are mapped to each other by 3d topological interfaces implementing bulk dualities and rescalings of the coupling. Together, these interfaces define a generalized action on 3d CFTs that includes both topological and non-topological manipulations. We finally comment on how to recover our results in a streamlined way from a SymTFT picture in 5d with corners. |
| Date: | Tue, 13.10.2026 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | ESI - Boltzmann lecture hall, Boltzmanngasse 9, 1090 Wien |
| Contact: | S. Fredenhagen, M. Sperling |
| Speaker: | María Belén GAVELA LEGAZPI (University of Madrid) |
| Abstract: | This is an introductory talk on the concept of axions and ALPs (axion-like particles), starting simply from the concept of Goldstone boson.
The field of axions and ALPs is blooming and undergoing accelerated expansion, both in experiment and theory. I will review both aspects of this quest.
Their impact on the understanding of the strong CP problem of QCD —which I will define— and on the nature of dark matter will be discussed in general, and focusing on very recent novel developments. |
| Date: | Tue, 13.10.2026 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | A. Hoang, M. Procura, J. Pradler |
| Understanding experiments of ultracold polar molecules with Path integral Monte Carlo |
| Speaker: | Matteo Ciardi (Institute of Theoretical Physics, TU Wien) |
| Abstract: | Ultracold polar molecules, cooled down to ultracold temperatures thanks to microwave shielding, offer exciting new opportunities to study and simulate strongly correlated quantum phases of matter. Recent experiments have realized the first Bose-Einstein condensates of molecules, and have characterized the formation of self-bound droplets in regimes much more strongly interacting than those previously seen in ultracold atoms.
Numerical simulations play a crucial role in interpreting experimental results and establishing new research directions. In this talk, we will discuss the application of different numerical techniques to ultracold molecules: from mean field methods, relatively simple but expected to fail for strong interactions, to quantum Monte Carlo methods, more expensive but also more reliable.
In particular, we will show how our Path Integral Monte Carlo simulations can be dir |
| Date: | Wed, 14.10.2026 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Atominstitut, Helmut Rauch Hörsaal |
| Contact: | Elena Redchenko |
| Finding extremal black holes in DSSYK - From the ultracold black hole towards flat space quantum gravity |
| Speaker: | Thomas Tappeiner (UGent) |
| Abstract: | The double scaled Sachdev-Ye-Kitaev model (DSSYK) has offered a rich playground for understanding UV complete quantum gravity and cosmology. The goal of this talk based on [arXiv:2608.04745] is to explain how this model offers a natural setting to describe the quantum dynamics of the mysterious ultracold limit of charged black holes in 4d de Sitter spacetime. After reviewing this black hole solution its thermodynamic features and introducing the DSSYK model I will turn to relating these models and explaining how the embedding in DSSYK allows for an exact quantization of the near horizon dynamics and how this relates to holography in flat spacetimes. |
| Date: | Thu, 15.10.2026 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | ITP, TU Wien, Wiedner Hauptstr. 8-10, Sem.R. DB gelb 10 |
| Contact: | Daniel Grumiller, Gerben Oling |
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