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Calendar of Physics Talks Vienna
| Duality defects in 2d Gauged Linear Sigma Models |
| Speaker: | Urmi Ninad (Univ. Bonn) |
| Abstract: | In this talk I will discuss certain 2d supersymmetric gauge theories (GLSMs) with a boundary which in the infrared flow to SCFTs that are relevant for string compactifications with D-branes. Certain non-abelian GLSMs exhibit Seiberg-like dualities which relate seemingly different ultraviolet theories with the same infrared physics. I extend the analysis of such dualities to theories with boundaries and propose the action of the duality on the boundary.
I geometrically realise these boundary degrees of freedom in terms of objects in the derived category of coherent sheaves for SCFTs admitting an NLSM description and demonstrate our approach using simple examples.
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| Date: | Tue, 29.10.2019 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, D. Grumiller. C. Zwikel, T. Schimannek |
| Kerr Primordial Black Holes: Towards New Constraints |
| Speaker: | Jeremy Auffinger (IPNL) |
| Abstract: | The primordial black holes solution to the dark matter issue has lately received much attention due to thenon-detection of dark matter particles (WIMPs or axions) in both direct and indirect channels. These black holes are expected to form at the very beginning of the Universe through the collapse of primordial density fluctuations. Depending on their mass distribution, they can have several observable consequences, thus allowing to set constraints on their density -- and the fraction of dark matter they can represent. The observations range from gravitational micro and femto-lensing to the emission of energetic particles through Hawking radiation. In this seminar, we will focus on the Hawking radiation constraints by extending them from the Schwarzschild primordial black holes (non-rotating) to the Kerr metric (rotating black holes) and from monochromatic [abridged] |
| Date: | Tue, 29.10.2019 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | Seminar Room, Apostelgasse 23, 1030 Wien |
| Contact: | Josef Pradler |
| Colour-Flow Evolution at Next-to-leading Order |
| Speaker: | Ines Ruffa (Univ. Wien) |
| Abstract: | im Rahmen des Seminars für Teilchenphysik: In order to investigate soft gluon evolution at NLO (next-to-leading order) the one-loop/one-emission and two-loop Feynman-diagrams have to be analysed.
I will give an introduction to the colour-space formalism, and discuss the evolution equations in colour space to resum non-global observables.
I will highlight the colour-flow basis as it not only provides immediate physical interpretation but it is also efficient in numerical approaches for soft gluon evolution.
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| Date: | Tue, 29.10.2019 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, S. Plätzer |
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