Cosmic ray propagation in the Universe in presence of a random magnetic field

A. D. SUPANITSKY

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

IOP PUBLISHING LTD

Lugar: Londres; Año: 2021 vol. 04 p. 1 - 11

1475-7516

The origin of the ultrahigh energy cosmic ray remains being a mystery. However,a considerable progress has been made in the past few years due to the good quality datarecorded by current cosmic ray observatories. One of the recent achievements is obtainingfirm observational evidence about the extragalactic origin of the most energetic cosmic raysby the Pierre Auger observatory. On the other hand, it is believed that there is a non-nullturbulent magnetic field that fills the intergalactic medium. Therefore, the presence of theintergalactic magnetic field can play an important role on the propagation of the ultrahighenergy cosmic rays through the Universe, which in principle can be relevant to interpretthe experimental data. In this work we present a system of partial differential equationsthat describes the propagation of the ultrahigh energy cosmic rays through the Universe, inthe presence of a turbulent intergalactic magnetic field, that includes the diffusive and theballistic regime of propagation and also the transition between them. Also, as an example ofapplication, the system of equations is solved numerically in a simplified physical situation.