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Calendar of Physics Talks Vienna
| Calabi-Yau manifolds and sporadic groups |
| Speaker: | Abhiram Kidambi (TU Wien) |
| Abstract: | One of the recent topics of interest in mathematical string theory is the study of the Mathieu moonshine and how it is realised in a string theoretic framework. It was shown by Eguchi, Ooguri and Tachikawa that the elliptic genus of the K3 surface has connections to the dimensions of the irreducible representations of the M_24 Mathieu group. In this talk, I shall give an overview of the (Mathieu) moonshine and present the results of a study of the (twined) elliptic genera expansion of CY 5-folds and relations to sporadic groups.
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| Date: | Tue, 14.11.2017 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Schrodinger lecture hall (5th floor), University Vienna, Strudlhofgasse 4/Boltzmanngasse 5 |
| Contact: | Daniel Grumiller and Stefan Fredenhagen |
| Cosmic Ray Physics — a short overview from the discovery to Dark Matter |
| Speaker: | Prof. Pierre Salati (LAPTH) |
| Abstract: | The discovery of cosmic rays has been the starting point of high-energy physics. A century later, their study is still a very active field with connections to cosmology. After a brief historical introduction, I will present the Leaky Box model which provides a very simple yet pedagogical framework to understand how charged particles propagate within the Milky Way. Probes of cosmic ray propagation, such as the boron-to-carbon ratio, readily point toward diffusive transport on which modern numerical codes such as Galprop, Dragon or Usine are based. After a presentation of how diffusion is implemented, I will discuss how cosmic rays are accelerated inside the Galaxy by violent events such as supernova explosions. I will finally discuss a few recent hot topics, in connection to Dark Matter searches.
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| Date: | Tue, 14.11.2017 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | HEPHY Library |
| Contact: | Suchita Kulkarni |
| Non-Abelian Discrete Groups and Neutrino Flavor Symmetry |
| Speaker: | Morimitsu Tanimoto (Niigata University) |
| Date: | Tue, 14.11.2017 |
| Time: | 16:15 |
| Location: | Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | W. Grimus, H. Neufeld |
| A globally stable blowup profile for supercritical wave maps |
| Speaker: | Roland Donninger (Vienna) |
| Abstract: | im Rahmen des joint relativity-geometric analysis seminars: Supercritical wave maps into spheres exhibit blowup via explicit self-similar solutions.
I will present a recent stability result of the blowup profile which is valid in a large region
of spacetime up to the Cauchy horizon of the singularity. This is joint work with P. Biernat (Bonn) and B. Schörkhuber (Vienna).
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| Date: | Thu, 16.11.2017 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel, S. Fredenhagen |
| Colloquium: The Enigma of the Highest Energy Particles in the Universe |
| Speaker: | Günter Sigl (DESY) |
| Abstract: | Cosmic rays have been observed up to several 10^20 eV through the showers of secondary particles they induce in the atmosphere. This is a macroscopic energy of up to 50 Joules, presumably in one elementary particle. The existence of such particles and their propagation through the highly structured Universe pose formidable challenges and exciting prospects at the same time: Their origin and sources have not been identified yet, but they already allow to test physics at center of mass energies unattained in the laboratory, albeit in a rather indirect way. We will give an overview over possible sources and acceleration mechanisms, issues related to cosmic ray mass composition, and other open questions and future prospects, including the role of secondary gamma-rays and neutrinos produced in primary cosmic ray interactions.
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| Date: | Fri, 17.11.2017 |
| Time: | 10:30 |
| Duration: | 60 min |
| Location: | Wohllebengasse 12-14 |
| Contact: | Suchita Kulkarni, Josef Pradler |
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