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Calendar of Physics Talks Vienna
| The Weakly Interacting Universe |
| Speaker: | Joachim Kopp (CERN & University of Mainz) |
| Abstract: | Many of the most fascinating phenomena in the Universe are governed by the weakest forces of nature: gravity, Standard Model weak interactions, and possibly even more exotic forces related to a "dark sector". In this colloquium, we will discuss two aspects of the weakly interacting Universe. We will first focus on gravitational waves at frequencies above a kHz, highlighting various possible sources both within the Standard Model and beyond, and introducing exciting detection concepts at the interface of astroparticle physics and quantum technology. The second part of the talk will be devoted to current and future opportunities in neutrino physics, in particular to novel astrophysical sources of low-energy neutrinos, and to the rich physics opportunities at future long-baseline experiments. [Job interview talk] |
| Date: | Mon, 03.03.2025 |
| Time: | 09:00 |
| Duration: | 75 min |
| Location: | Fachgruppenraum of the Faculty of Physics, Wiedner Hauptstr. 8, Freihaus, yellow area, 1st floor, opposite the Mensa |
| Contact: | Daniel Grumiller |
| Model spaces as constrained Hamiltonian systems I. Application to SU(2) |
| Speaker: | Glenn Barnich (University of Brussels) |
| Abstract: | Motivated by group-theoretical questions that arise in the context of asymptotic symmetries in gravity, we study model spaces and their quantization from the viewpoint of constrained Hamiltonian systems. More precisely, we propose a definition of a model space for a generic Lie group G as a suitable second class constrained system associated to the cotangent bundle $T^{*}G$. Before turning to the non-compact infinite-dimensional groups relevant in the gravitational setting, we work out all details in the simplest case of $\mathrm{SU}(2)$. Besides recovering well-known results on the quantum theory of angular momentum from
a unified perspective, the analysis sheds some light on the definition and properties of spin-weighted/monopole spherical harmonics. |
| Date: | Tue, 04.03.2025 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | S. Fredenhagen, M. Sperling |
| The renormalization of the Standard Model effective field theory |
| Speaker: | Mikael Chala (University of Granada) |
| Abstract: | I will discuss the recent progress towards renormalizing the Standard Model effective field theory to order (v/f)^4, with v being the electroweak scale and f the new physics threshold, that we have made using diagrammatic techniques off-shell. I will also discuss the interplay with amplitude methods and positivity bounds.
Likewise, I will elaborate on how we have dealt with difficulties such as removing (unphysical) interactions that vanish upon using appropriate field redefinitions.
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| Date: | Tue, 04.03.2025 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | A. Hoang, M. Procura |
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