1812.02950
Origin of the first cosmic rays
Ohira, Murase
Non-thermal phenomena are ubiquitous in the Universe, and CRs play various roles in different environments. When, where and how CRs are first generated shine the Big Bang? Argue that blast waves from the first cosmic explosions at z~20 lead to Weibel mediated non relativistic shocks and CRs can be generated by the diffusive shock acceleration mechanism. Show that protons are accelerated at least up to sub-GeV energies, and the fast velocity component of SN ejecta is likely to allow CRs to achieve a few GeV in energy. Discuss other possible accelerators of the first CRs, including accretion shocks due to the cosmological structure formation. These CRs can play various roles such as the magnetic field amplification in the early universe.
Origin of the first cosmic rays
Ohira, Murase
Non-thermal phenomena are ubiquitous in the Universe, and CRs play various roles in different environments. When, where and how CRs are first generated shine the Big Bang? Argue that blast waves from the first cosmic explosions at z~20 lead to Weibel mediated non relativistic shocks and CRs can be generated by the diffusive shock acceleration mechanism. Show that protons are accelerated at least up to sub-GeV energies, and the fast velocity component of SN ejecta is likely to allow CRs to achieve a few GeV in energy. Discuss other possible accelerators of the first CRs, including accretion shocks due to the cosmological structure formation. These CRs can play various roles such as the magnetic field amplification in the early universe.
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