Cosmic ray propagation in turbulent magnetic fields

Propagation of cosmic rays (CRs) in turbulent and magnetized astrophysical media is a long-standing problem that requires both understanding the properties magnetic fields their interaction with energetic particles. This review focuses on selected recent theoretical findings made based progress simulating magnetohydrodynamic (MHD) turbulence. In particular, we address perpendicular parallel propagation CRs identify conditions when superdiffusive diffusive. For diffusion, discuss problems traditionally used diffusion mechanism arising from pitch angle scattering possible solutions provided by recently identified “mirror diffusion” presence mirrors.