Entering the cosmic ray precision era
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Here we outline some recent activities in the theory and phenomenology of Galactic cosmic rays, in the light of the great precision of direct cosmic ray measurements reached in the last decade. In the energy domain of interest, ranging from a few GeV/nucleon to tens of TeV/nucleon, data have revealed some novel features requiring an explanation. We shall emphasize the importance of a more refined modeling, of achieving a better assessment of theoretical uncertainties associated to the models, and of testing key predictions specific of different models against the rich datasets available nowadays. Despite the still shaky theoretical situation, several hints have accumulated suggesting the need to go beyond the approximation of a homogeneous and non-dynamical diffusion coefficient in the Galaxy.
KeywordsCosmic rays astroparticle physics interstellar medium
The author would like to thank all his collaborators on the topics covered in this manuscript, as well as the organizers of the AAPCOS2018 conference and, in particular, Pratik Majumdar for his kind invitation, and the warm atmosphere, which stimulated the considerations reported in this article.
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