Ultra High Energy Cosmic Rays from Axion Stars
Abstract
We propose a model in which ultra high energy cosmic rays are produced by collisions between neutron stars and axion stars. The acceleration of such a cosmic ray is made by the electric field, 1015 (B/1012 G) eV cm-1, which is induced in an axion star by the strong magnetic field B>1012 G of a neutron star. As we have shown previously, similar collisions generate gamma ray bursts when the magnetic field is much smaller, e.g. 1010 G. If we assume that the axion mass is 10-9 eV, we can explain huge energies of the gamma ray bursts 1054 erg as well as the ultra high energies of the cosmic rays 1020 eV. In addition, it turns out that these axion stars are plausible candidates for MACHOs. We point out a possibility of observing monochromatic radiations emitted from the axion stars.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.