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Calendar of Physics Talks Vienna
| Fun with regularization and renormalization |
| Speaker: | Dominik Stöckinger (TU Dresden) |
| Abstract: | The history of regularization and renormalization is full not only of important breakthroughs and fundamental theorems but also of puzzles and paradoxical, inconsistent, or wrong results. Many issues have been clarified in the past years, leading to interesting conceptual insights into quantum field theory and to results of practical importance. The talk will first focus on variants of dimensional regularization, give a brief overview of the historical development and provide a precise definition of all schemes and their differences. New results regarding
the infrared structure of QCD and regarding supersymmetry-preserving
regularizations will be explained. Then the talk will focus on the renormalization of gauge theories. The role of Slavnov-Taylor identities as tools will be explained.As an application, the renormalization properties, gauge dependence and beta functions of vacum |
| Date: | Tue, 10.05.2016 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, Y. Wang |
| Discovery of Sterile Neutrinos at the LHC |
| Speaker: | C.S. KIM (Yonsei Univ., Seoul, Korea) |
| Date: | Wed, 11.05.2016 |
| Time: | 11:00 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Ludwig-Boltzmann-Hörsaal, Strudlhofgasse 4, Erdgeschoß |
| Contact: | H. Neufeld, W. Grimus |
| Estimating source parameters of GW150914: The role of waveform models and numerical relativity simulations |
| Speaker: | Michael Pürrer (MPI Golm) |
| Abstract: | On September 14, 2015, the Laser Interferometer Gravitational-wave Observatory (LIGO) detected a gravitational-wave (GW) transient (GW150914). We characterise
the properties of the source and its parameters with Bayesian parameter estimation algorithms using waveform models that describe GWs emitted from binary black holes in general relativity. In addition, we compare these models against a set of numerical relativity (NR) waveforms in the vicinity of GW150914. Simplifications are used in the construction of some waveform models, such as restriction to spins aligned with the orbital angular momentum, no inclusion of higher harmonics in the GW radiation, no modeling of eccentricity and the use of effective parameters to describe spin precession. In contrast, NR waveforms provide us with a high fidelity representation of the "true" waveform modulo small numerical errors. . . . . |
| Date: | Thu, 12.05.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | H. Rumpf |
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