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Calendar of Physics Talks Vienna
| Carrollian and non-relativistic limits of higher-spin fields |
| Speaker: | Lea Mele (University of Mons) |
| Abstract: | Motivated by recent applications of Carrollian symmetry, various Carroll-invariant field theories have been constructed and studied. Two distinct Carrollian theories, commonly referred to as magnetic and electric, can be obtained. In this talk, I will first present the Carrollian limits of relativistic spin-1/2 Dirac fermions in arbitrary spacetime dimensions. I will highlight the subtleties that arise due to the first-order nature of fermionic Lagrangians, and how one can nevertheless obtain two different Carrollian limits. I will then show how to generalise these results to free higher-spin fermions described by the FangâFronsdal action.
I will also briefly discuss the dual non-relativistic limit, obtained by sending the speed of light to infinity, applied to massive higher-spin fields. The resulting Schrödinger actions find natural applications in the fractional quantum Hall effect |
| Date: | Tue, 05.05.2026 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | S. Fredenhagen, M. Sperling |
| Higgs near-criticality at future colliders |
| Speaker: | Maria Belen Gavela Legazpi (University of Madrid) |
| Abstract: | This is an introductory talk to the concept and recent developments on near-criticality of the Higgs potential. I first define the electroweak hierarchy problem and introduce the general concepts of naturalness and of near criticality of the Higgs potential, as alternative paths to confront that problem.
Within the near-criticality framework, the smallness of the Higgs mass may be a byproduct of the metastability of the Higgs potential. Strong bounds on the Higgs mass result in all generality, provided there is new viable physics capable of lowering the scale at which the Higgs quartic coupling turns negative. The new physics scale must then be within reach of future experiments including future colliders such as the FCC. As a concrete and ultraviolet-complete realisation, I will finally explore the low-scale Majoron model of neutrino masses.
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| Date: | Tue, 05.05.2026 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | A. Hoang, M. Procura |
| Programmable control of the spatiotemporal quantum noise of light |
| Speaker: | Michael Horodynski (Photonics Institute, TU Wien) |
| Abstract: | Understanding and controlling multimode nonlinear photonic systems is crucial for applications like high-power fiber lasers, optical communications, mode-locked lasers, wavefront shapers, and physical neural networks. So far, the focus has been on controlling the average (so-called "mean-field") properties of light: those described by the classical Maxwell equations. At the same time, the statistical properties of light are of both fundamental interest and potential practical importance for the applications above. Specifically, quantum noise sets fundamental limits on applications (e.g., imaging, communications, and interferometry). Overcoming such limits requires generating quantum states of light, such as squeezed or entangled states, as enabled by second- and third-order nonlinear media.
In this seminar, we will show theoretically that in multimode nonlinear systems (natural experime |
| Date: | Wed, 06.05.2026 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Atominstitut, Helmut Rauch Hörsaal |
| Contact: | Elena Redchenko |
| Speaker: | Ludovico Lami (Scuola Normale Superiore on Pisa) |
| Abstract: | folgt |
| Date: | Fri, 08.05.2026 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | VCQ Nadine Hilmar |
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