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Calendar of Physics Talks Vienna
| Higher-form symmetries and how to gauge them |
| Speaker: | Benjamin Haake (University of Edinburgh) |
| Abstract: | I will give a general introduction to higher-form symmetries and their gauging and discuss both of these in the context of defect TQFTs.
Following the insight that ordinary, group-like global symmetries can be described by topological codimension 1 defects, higher-form symmetries are the generalization to arbitrary codimension. A natural question is how to gauge (higher-form) symmetries from this perspective. I will briefly motivate the orbifold construction as a tool for gauging and present a new construction that produces a candidate orbifold datum from 2-group symmetries in 3d. Lastly, I will use this construction to recover a known class of orbifold data from a 0-form symmetry and show how its gauging can be undone by the gauging of an emergent 1-form symmetry.
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| Date: | Tue, 08.04.2025 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | S. Fredenhagen, M. Sperling |
| Walking in the Hidden Valley: Exploring dark parton showers in the conformal window |
| Speaker: | Joshua Lockyer (University of Graz) |
| Abstract: | Dark-showers offer a compelling collider signature for Hidden Valley models featuring a confining dark sector. Our work extends these investigations to models with many more dark quark flavours where such theories enter the âconformal window''. Here, existing running coupling approximations in current event generators break down and so we must implement the exact two-loop RGE solution. This, alongside the two-loop Sudakov factor that employs this coupling, allows us to present the first phenomenological results of the parton showers of such near-conformal dark sectors. |
| Date: | Tue, 08.04.2025 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | A. Hoang, M. Procura |
| Global critical points of the Standard Model on expanding spacetimes |
| Speaker: | Marko Sobak (University of Vienna) |
| Abstract: | The Standard Model (SM) is one of the greatest successes of modern theoretical physics. Despite this, mathematical references studying the full SM (rather than just its sectors in isolation) on curved spacetimes are somewhat scarce, even though it seems important to understand the theory at a classical level in a more geometric setting. In my talk, I will first briefly review the mathematical structure of the SM Lagrangian, the corresponding Euler-Lagrange equations, and some of their basic properties, particularly related to conformality. Then, I will present a global existence result for the SM equations on four-dimensional spacetimes of expanding type. The talk is focused on a geometrically intrinsic approach to the theory, and the main ingredient for the proof is a gauge-invariant energy estimate.
This is joint work with Volker Branding.
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| Date: | Wed, 09.04.2025 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Seminar Room A, Waehringer Str. 17, 1090 Wien, 2nd floor |
| Contact: | D. Fajman |
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