Ultra High Energy Cosmic Rays and Gamma Ray Bursts from Axion Stars
Abstract
We propose a model in which ultra high energy cosmic rays and gamma ray bursts 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 relatively strong magnetic field B>1012 G of a neutron star. On the other hand, similar collisions generate gamma ray bursts when magnetic field is relatively small, e.g. ≤ 1010 G. Assuming 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. We estimate rate of energy release in the collisions and we find that the rate roughly agrees with observations. In addition, we show that these axion stars are plausible candidates for MACHOs. Since the axion star induces oscillating electric current under the magnetic field, observable monochromatic radiations are emitted.
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