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Calendar of Physics Talks Vienna
| Recent developments in superstring loop amplitudes |
| Speaker: | Oliver Schlotterer (Uppsala University) |
| Abstract: | In this talk, I will review motivations, results and strategies for loop amplitudes in superstring theories.
Based on chiral splitting of correlation functions for closed-string vertex operators, a simplified result
will be presented for two-loop five-point amplitudes involving massless type-II states. |
| Date: | Tue, 17.05.2022 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Zoom https://univienna.zoom.us/j/67811513400?pwd=Y3V4VGQxZFd3aVk0VWpNNElaSVlYZz09 ID meeting: 678 1151 3400 Passcode: 634297 |
| Contact: | S. Fredenhagen, D. Grumiller, E. Battista, O. Krueger |
| Colour and Electroweak Evolution |
| Speaker: | Simon Plaetzer (Univ. Graz) |
| Abstract: | Detailed and precise predictions for high energy collisions require a deep understanding of amplitudes with many external legs,
both as a basis for analytic resummation as well as for more universal event generator simulations. In a strive to improve event
generators and to build numerical resummation procedures, evolution equations at the amplitude level are a universal starting point.
I will discuss recent developments in QCD, with a particular focus on measurement projections and accuracy.
I will then link the intricacies of this picture to electroweak amplitude factorization and sketch how a coherent framework of QCD
plus electroweak evolution can be achieved. |
| Date: | Tue, 17.05.2022 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Fakultaet für Physik, Boltzmanngasse 5, 5. Stock sowie ZOOM https://univienna.zoom.us/j/93427906843?pwd=YjhSejdUVW16QjVQYUh5TVNSNFNhQT09 |
| Contact: | A. Hoang, M. Procura |
| Spin interaction of neutrons with an intensive laser pulse |
| Speaker: | Christian Spreitzer (Vienna) |
| Abstract: | We study the Dirac equation for neutral particles with a magnetic moment in the field of an ultrashort electromagnetic pulse.
The pulse is modeled as a delta-distribution, concentrated on a null (i.e. lightlike) hyperplane. We show that the solutions can be obtained
by "gluing" free solutions along the pulse and derive corresponding matching conditions. For the special case of a homogeneous electromagnetic pulse,
i.e. constant field strength, we explicitly calculate the change in the spin orientation. This is joint work with Peter C. Aichelburg and Herbert Balasin. |
| Date: | Thu, 19.05.2022 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | Gravitationsphysik, Seminarraum A - Währinger Strasse 17, 2. Stock - ZOOM https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 |
| Contact: | P. Chrusciel, D. Fajman |
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