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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 |
| Towards a quantum processor with programmable connectivity and non-local interactions |
| Speaker: | Franz von Silva-Tarouca (TU Wien, Atominstitut) |
| Abstract: | Quantum computers and simulators are especially promising for tackling problems that require a high degree of entanglement. However, the efficient and deterministic generation of many-body entanglement still poses a challenge.
We are building a quantum processor based on an array of single atoms trapped in optical tweezers and strongly coupled to a high-finesse fiber cavity. The cavity enables non-local interactions, mediated by the joint coupling of the atoms to the cavity mode. Microscopic addressing via the optical tweezers allows for tuning this coupling for each atom, enabling programmable connectivity. This, combined with other established techniques in cavity quantum information processing, provides us with an extensive experimental toolkit for generating many-body entanglement and a variety of quantum computation and simulation experiments.
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| Date: | Wed, 05.03.2025 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Maximilian Prüfer |
| New frontiers in quantum simulation and sensing via cavity mediated interactions |
| Speaker: | Ana Maria Rey (University of Colorado) |
| Abstract: | Atoms and photons are the fundamental building blocks of our universe. Their interactions rule the behavior of our physical world but at the same time can be extremely complex, especially in the context of many-body quantum systems. Understanding and harnessing them is one of the major challenges of modern quantum science. In recent years, ultracold atomic systems have emerged as a pristine platform for the exploration of atom-light interactions. In this talk, I will discuss the potential of atomic systems loaded in optical cavities as a resource to enhance the energy scales needed to observe complex many-body behaviors by harnessing infinity range interactions mediated by photons that can couple a large set of internal levels. I will show how cavity systems can help us not only to shed light on behaviors of iconic Hamiltonians describing real materials but also to engine |
| Date: | Fri, 07.03.2025 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Elena Rechenko |
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