Abstract
Recently, several non-linear theories for cosmic ray transport have been proposed to achieve agreement with numerical test particle simulations. Some of these theories, which can be seen as an improvement of quasi-linear theory, agree with simulations. Because recent reports have shown that the perpendicular mean free path could be larger than the parallel mean free path, the assumption of strong turbulence could be reasonable. Therefore, a comparison between different theories and simulations done in the strong turbulence parameter regime for slab/2D composite geometry is presented. It is shown that transport theories and simulations can explain that the perpendicular mean free path can become larger than the parallel mean free path. Further, it is demonstrated that theories cannot reproduce simulations for strong turbulence with high accuracy.
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