The Giant Radio Array for Neutrino Detection (GRAND) is a future observatory with unprecedented sensitivity to ultra-high energy (UHE) neutrinos. UHE neutrinos and cosmic rays (CR) induce extensive air showers (EAS) when they enter Earth's atmosphere. These EAS emit radio signals, which offer information on the mass, energy and arrival direction of the incoming CR.
GRAND is planned as a...
The Pierre Auger Observatory is the world's largest detector for the detection of ultra high energy cosmic rays. It is designed as a hybrid detector with a Surface Detector (SD) and a Fluorescence Detector (FD) as its baseline components. The SD consists of 1600 stations, which cover an area of 3000 km$^2$. The entire field of the SD is overlooked by 27 telescopes, which are located at four FD...
Radio detection of neutrinos opens the possibility of measuring neutrinos with an energy above $10^{16}$ eV. The Radio Neutrino Observatory Greenland (RNO-G) is designed to measure the astrophysical neutrino flux at energies higher than IceCube and will enable investigations of fundamental physics at energies that are not attainable by particle accelerators. It uses an array of radio sensors...
Studying massive, relaxed galaxy clusters at high redshifts is key to understand the theoretical and numerical models of structure formation and evolution on cosmological time scales. An attempt is made to study the relaxed state of MACS J1423.8+2404 (z = 0.54, MACS J1423) using gravitational lensing. The MAssive Cluster Survey (MACS, Ebeling et al. 2001) is a compilation of very X-ray...
Galaxy clusters are the most massive gravitationally-bound objects in the universe, and analysis of their structure can yield many fascinating answers and equally fascinating questions about the nature of the physics that holds them together. The presence of dark matter in galaxy clusters is one of the most pressing of these fascinating questions, and there are many techniques that are...
The strong gravitational lensing effect is a powerful technic to study both the deflector of light and the magnified sources behind it. In this talk, I will first review lens modelling approaches of galaxy clusters and present a state-of-the-art lensing mass model combining at the same time the Hubble Space Telescope, James Webb Space Telescope and large spectroscopic coverage. Such a...
