Résumé / Abstract Seminaire_GReCO
SÉMINAIRE DU 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 howthe ynergalactic 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

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