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- 12.05., Patrick Reichherzer (RUB Bochum): Influence of diffusive cosmic-ray transport on multimessenger observables
Abstract: Cosmic-ray transport in astrophysical environments is often dominated by diffusion in a magnetic field with a turbulent component. The diffusion properties of charged particles directly influence observable properties, such as the spectrum of cosmic rays and their secondaries produced in interactions. In many diffusion scenarios, the simplified assumption of fully resonant Kolmogorov diffusion in the quasi-linear limit results in a parallel diffusion coefficient D ~ E^(1/3). A quantitative investigation of the scattering regimes, however, shows that the diffusion coefficient tensor can deviate significantly from this behaviour. In this talk, the complex dependencies of charged particle diffusion on the turbulence level of the magnetic field are presented. Examples of how this affects observational signatures will be shown in the context of galaxies or the transient sky, i.e., flaring Blazars.
- 124.5. Karri Koljonen (IFY): Shocking news - a polarizing study of a tidal disruption event
Abstract: Supermassive black holes have been known to disrupt passing stars producing outbursts called tidal disruption events (TDEs) offering a unique view on the early stages of the accretion disk and jet formation. The advent of large-scale optical time-domain surveys has significantly increased the number of known events and challenged our understanding of their dynamics and emission processes. Especially, the so-called optical TDEs have shown late-time X-ray and radio emission years after the optical peak emission indicating delayed accretion disk formation and long timescales for the circularization process. In this seminar, I will present our study on the most polarized TDE up-to-date without any indication of contribution from a jet to the emission. Our observations demonstrate that optical TDE emission can be powered by tidal stream shocks.
- 19.5. Sven Heinemeyer (IFT (CSIC), Madrid): New Physics around the corner?!
Abstract: Three recent experimental results will be reviewed that deviate from the Standard Model (SM) prediction by $\sim 4 \sigma$. These are the anomalous magnetic moment of the muon, excesses in the searches for light Higgs bosons at the LHC and the measurement of the W-boson mass by CDF. The implications for new physics beyond the SM as well as corresponding
prospects for future experiments will be discussed.
- 25.05. Inga Strumke (AI Lab, NTNU): Introduction to machine learning - a guided tour with examples from particle physics -- PART II
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