Seminars WS 17/18
Tue 17.10.2017, 16.30 h (28B110)
Herbert Dreiner (Bonn)
R-Parity violation at the LHC
Supersymmetry is a well motivated extension of the SM. It comes in two variants: with and without R-parity. We motivate a "standard" model of R-parity violation and using CheckMATE determine how well it has been tested at the LHC and give corresponding mass bounds.
Tue 14.11.2017, 16.30 h (28B110)
Thierry Lasserre (CNRS)
Sterile Neutrinos & Dark Matter
Sterile Neutrinos & Dark Matter Abstract: Sterile neutrinos are hypothetical particles insensitive to the standard weak interaction. They could mix with the active neutrinos, however. Light (eV-scale) sterile neutrinos are intensively being searched by many experiments using neutrino beams, nuclear reactors, and radioactive sources. Moreover massive relic sterile neutrinos at the keV mass scale are well suited candidates to explain the Dark Matter in our Universe. We will review the current status and discuss the experimental perspectives for detecting Dark Matter sterile neutrinos. We will focus on the next generation of beta-decay and neutrino capture experiments.
Tue 21.11.2017, 16.30 h (28B110)
Aaron Vincent (Imperial College)
Illuminating the dark sector with astrophysical neutrinos
IceCube’s observation of high-energy extra extraterrestrial neutrinos has signalled the dawn of neutrino astronomy. These events carry energies upward of a PeV and are isotropically distributed in the sky, and thus far their origin remains unknown. However, these data contain valuable information in their energy, flavour composition and arrival directions. I will demonstrate how these observables can already be used to learn about new physics, and specifically discuss the case of dark matter-neutrino interactions, which have long been studied in the low-energy limit of cosmology.
Tue 12.12.2017, 16.30 h (28B110)
Jorg Horandel (Nijmegen)
Observing the low-frequency universe with LOFAR
The LOFAR radio telescope is observing the universe at frequencies from 10 to 240 MHz. This is a unique window not previously explored by other observatories. We will give an overview on the LOFAR key science projects, namely: Epoch of Reionisation, Deep extragalactic surveys, Transient sources, Solar science and space weather, Cosmic magnetism, and Ultra high energy cosmic rays. Main focus of the talk will be recent results from the key science project Cosmic Rays. In the last years we achieved a breakthrough in the radio detection of extensive air showers and we have established the radio technique as standard tool to measure the properties of cosmic rays, such as their arrival direction, their energy, and their particle type/mass.
Tue 23.01.2018, 16.30 h (28B110)
Walter Winter (Würzburg)