A few grams of matter in a bright world

par Benjamin Rouillé d'Orfeuil (LAL)

mardi 12 févr. 2013, 11:00 → 12:00 Europe/Paris

Salle 101 (LAL)

The study of the most energetic component of the cosmic ray radiation, whose constituents - the ultrahigh energy cosmic rays (UHECRs) - have macroscopic energy, gives rise to numerous theoretical, phenomenological and experimental efforts. The observation of particles from space that reach the terrestrial atmosphere with energies exceeding 10^20 eV is puzzling and poses some interesting and challenging physical/astrophysical questions. In an attempt to characterize the UHECR radiation, it is necessary to consider its three spectral dimensions: energy, mass and angular spectra. Indeed, these are tightly connected and will depend on: the angular distribution of UHECR sources and their density, the injected spectrum and composition and the propagation of UHECRs from their source to the Earth due to the interactions with low-energy photon backgrounds and deflections in magnetic fields. I will discuss the impact of these astrophysical parameters on the UHECRs observables.

Poster SemBRO.pdf

Transparents BRdO_12022013.pdf