Collision between Neutron Star and Axion Star as a Source of Gamma Ray Burst and Ultra High Energy Cosmic Ray

Details Collision between Neutron Star and Axion Star as a Source of Gamma Ray Burst and Ultra High Energy Cosmic Ray Collision between Neutron Star and Axion Star as a Source of Gamma Ray Burst and Ultra High Energy Cosmic Ray

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003omeg.conf..339i&link_type=abstract

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2000. Proceedings of the International Symposium. Held 19-21 January 2000 in Universi

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We propose a model in which the ultra high energy cosmic rays and gamma ray bursts are produced by collisions between neutron stars and axion stars. An acceleration of the cosmic ray is done by an electric field, ~ 1015 eV cm-1, which is induced in the axion star by the strong magnetic field > 1012 G of the neutron stars. On the other hand, gamma ray bursts are generated in the collisions between axion stars and neutron stars with relatively small magnetic field, e.g. ~ 1010 G. In the former case the axion star evapolates emitting ultra high energy cosmic rays before colliding directly with the neutron stars, while in the latter case the axion star collides directly with the neutron star and dissipates rapidly its whole energy in an outercrust of the neutron star, which leads to a gamma ray burst. To explain both phenomena we need to assume the mass of the axion such as 10-9 eV. With this choice we can explain huge energies 1054 erg of the gamma ray bursts as well as the ultra high energies ~ 1020 eV of the cosmic rays. Additionally, it turns out that these axion stars are plausible candidates for MACHOs.

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