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Calendar of Physics Talks Vienna
| Composite and holographic axions and the dynamics of instanton densities |
| Speaker: | Elias Kiritsis (S. Fredenhagen, D. Grumiller. I. Lovrekovic, T. Schimannek) |
| Abstract: | Phenomena associated with instanton density operators in QFT are explored. These include
1) Instanton densities of "Hidden theories" coupled to the SM may provide emergent axions that are composites/bound-states of the hidden fields, driven by paradigms emerging from the AdS/CFT correspondence. They provide novel models of (composite) axions distinct from elementary ones in regions of parameter space.
2) The dynamics of instanton densities (dual to bulk axions) in holographic gauge theories has several interesting peculiarities. A non-trivial axion profile is dual to the (non-perturbative) running of the θ-term for the corresponding instanton density operator.
3) We can use holography to calculate non-derivative ouplings to nucleons that are od paramount importance for axion physics.
4) There is a novel instability in theta-depedent gauge theories tied to the axion swamplant conjecture. |
| Date: | Tue, 21.04.2020 |
| Time: | 13:45 |
| Location: | zoom - please ask organizers for link and password |
| Contact: | S. Fredenhagen, D. Grumiller. I. Lovrekovic, T. Schimannek |
| WEBINAR: Cryogenic dark matter searches - CRESST and COSINUS |
| Speaker: | Dr. Florian Reindl (HEPHY - ÖAW, Atominstitut - TU Wien) |
| Abstract: | Today, direct searches for interaction of dark matter particles in earth-bound detectors apply a large variety of different technologies to probe a wide range of potential dark matter particle masses. Cryogenic detectors play a key role in this endeavor due to their low threshold and, thus, their high sensitivity for light dark matter particles. The CRESST experiment is located at the Italian Gran Sasso underground laboratory (LNGS) and operates CaWO4 crystals at mK-temperatures. In this talk I will present recent results obtained with a detector with an unprecedented low nuclear recoil threshold of 30.1eV pushing the sensitivity to dark matter particles as light as 160 MeV. [more details here: https://indico.smi.oeaw.ac.at/event/361/] |
| Date: | Wed, 22.04.2020 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Webinar [more details here: https://indico.smi.oeaw.ac.at/event/361/] |
| Contact: | Prof. Dr. Eberhard Widmann, Dr. Martin Simon |
| Supersymmetric Flux compactifications and Calabi-Yau Modularity |
| Speaker: | Richard Nally (SITP, Stanford University) |
| Abstract: | Most familiar constructions in string theory are rooted in the complex geometry of the compact dimensions. On the other hand, much of modern mathematics focuses on arithmetic geometry, where we consider the properties of varieties over smaller fields such as Q. In this talk, following recent work (arXiv:2001.06022) with S. Kachru and W. Yang, I will explain how string theory can be related to arithmetic. In particular, I will argue that supersymmetric flux vacua admit arithmetic structures closely related to those of elliptic curves. |
| Date: | Thu, 23.04.2020 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Zoom (contact abhiram[DOT]kidambi[AT]tuwien[DOT]ac[DOT]at for details) |
| Contact: | Abhiram Kidambi |
| Supersymmetric Flux Compactifications and Calabi-Yau Modularity |
| Speaker: | Richard Nally (SITP, Stanford) |
| Abstract: | TBA |
| Date: | Thu, 23.04.2020 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Zoom (pls contact organizer for details) |
| Contact: | Abhiram Kidambi |
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