Séminaire / Seminar GReCO |
| « A quest for sources of ultrahigh energy cosmic rays » |
|
K. Kotera |
| The origin of ultrahigh energy cosmic rays (UHECRs) has not been unveiled in spite of decades of experimental and theoretical research. In this talk, I discuss the observable signatures that would constrain the possible sources to one single suspect. In particular, I will present the anisotropy signatures expected for various types of sources, and describe how the intergalactic magnetic field plays a prominent role in this picture. For this purpose, I will introduce an analytical formalism to study the propagation of UHECRs in the magnetized Universe. Another constraint on the sources might come from multi-messenger signatures (in gamma-rays, neutrinos and gravitational waves) that can be produced together with UHECRs. I will present the expected fluxes for various astrophysical scenarios and discuss to which extent these signals could pin-point the actual sources of UHECRs. In light of this discussion, I will briefly present the latest results of the Pierre Auger Observatory and give requirements for future detectors in UHECRs, neutrinos, gamma rays and gravitational waves, to solve this long-standing enigma. |
|
lundi 29 novembre 2010 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |