Particle Acceleration in supernova remnants and its implications for the origin of galactic cosmic rays

par Pasquale Blasi (ARCETRI Florence)

jeudi 8 mars 2012, 11:00 → 12:00 Europe/Paris

Auditorium Marcel Vivargent (LAPTH)

The process of cosmic ray energization in supernova remnant shocks is described by the theory of non linear diffusive shock acceleration (NLDSA). Such theory is able to describe the acceleration itself, the dynamical reaction of accelerated particles on the shock, and the crucial phenomenon of the magnetic field amplification, the very key to generate high energy cosmic rays. I will illustrate the basic aspects of this theoretical framework, as well as its successes and problems. I will then discuss the observations, in X-rays and with Fermi-LAT and Cherenkov teelscopes in the gamma rays, that can provide tests of the so-called supernova remnant paradigm for the origin of cosmic rays. The implications of NLDSA for observations of cosmic ray spectra, composition and anisotropy will also be discussed. Finally, I will illustrate some new ideas on particle acceleration in partially ionized media, that hold to promise to provide an unprecedented way to look at the sources of cosmic rays.

Slides Blasi